Austin Custom Brass LEGACY Acrylic Trumpet Mouthpiece Tops

Austin Custom Brass
"I am a HUGE fan of these tops. More comfy ("softer") feel than metal without giving up much brilliance of sound. I now use on my Bb, C, D, Eb, and picc." -Steven Heitzer
(27 reviews)
0.50 LBS
4.00 (in)
4.00 (in)
4.00 (in)
Current Stock:
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Our Legacy Series Mouthpiece Tops in Beautiful, Comfortable Acrylic!

I started making and playing on acrylic mouthpiece tops due to my allergies to silver and gold, but they've become incredibly popular with our customers as well! They're super comfy! They feel a little softer than metal tops, and they won't feel as cold on your chops. The acrylic is fairly dense (denser than Delrin) so the sound is pretty close to a similar metal top. We also have a wide variety of colors, so you can get a look that's fairly subtle or one that draws plenty of attention.

All designs from our Standard Series trumpet mouthpieces are available!

Top only: no backbore included.

We use the industry standard "Warburton" threads so these tops will work with backbores from a wide variety of makers (of course we're partial to our ACB Backbores). Acrylic tops are available in our standard blank only. Give us a call at 816-410-0826 or email with any questions or to place an order!

Click here to see equivalencies!

All Austin Custom Brass trumpet mouthpieces are made in the USA with the absolute best tolerances in the industry!

Call Josh at the Mouthpiece Hotline with questions or to order! +1 (781) 944-6247 x700 or send an email to

All custom orders run 8-19 weeks from payment and must be paid in full before the order is made. Due to the huge selection of models and colors, many acrylic tops are custom made to order. Please email if you have any questions about mouthpiece delivery timelines.

Scroll down to read our detailed mouthpiece top and backbore descriptions, and customer reviews like these:

"Very pleased with the acrylic top in terms of feel, performance and sound. Much appreciate the ACB quality as always in mouthpieces. The pairing with backbore suggested by Josh works well for projection and dynamics. Many thanks." -Ernie

"I am a HUGE fan of these tops. More comfy ("softer") feel than metal without giving up much brilliance of sound. I now use on my Bb, C, D, Eb, and picc." -Steven

Larger Sized ACB  mouthpieces (.674+): 

  • Papa Bear: This mouthpiece is not for the faint of heart! It has an extremely large mouthpiece (.684) which puts it around an old Bach 1 diameter. The cup is a large bowl, throat #20 and a custom backbore give this piece the most efficiency while maintaining a HUGE sound.  
  • Bee Bear: Similar to the Papa this mouthpiece has a medium large b-shaped bowl, and slightly smaller backbore.
  • New York 1: This originally started out as a CMM scan of a very early New York Bach 1 mouthpiece. The cup and rim are very similar, the backbore and throat are matched with this cup to produce a very large sound shape. This is a great orchestral mouthpiece!
  • 1C: This is my take on an older Bach 1C but with an improved throat and backbore combo. It feels significantly more efficient and sounds more energized while maintaining a rich core throughout all registers. This mouthpiece has our standard 24 throat and 10/24 combo backbore.

"I've been playing the Cee Bear now for 2 months and the more I use it and the more I compare it to other mouthpieces, the more I like it. It is extremely easy and fast responding, making it much easier for me to play more beautiful. The sound is full, but not dull and works great on my Bb and C trumpet. Even though it is a very large rim, I do not seem to sacrifice any notes in the upper register. My sound on Bb and C never sounded better. I mainly play in a local Orchestra and for that purpose it is the best I ever had." -a satisfied customer

Smaller Symphonic sized mouthpieces (.668-674):

  • 1.25 CB: This has a classic Bach Mt. Vernon 1-1/4C mouthpiece rim that's blended in the CAD  program with a great old Bach 5B cup. The result is an incredibly rich sounding mouthpiece without losing efficiency or having the turbulent points caused by a traditional "screw-rim"  setup.
  •  1.25C: This is  a take on a great 1 1/4C mouthpiece with some refinements in bore, backbore, and throat. To me it feels more like a 1.5C due to the great efficiency. 
  • 1 1/2B: This is a great sounding orchestral mouthpiece. While not as wide as the Papa Bear (the diameter is like a modern 1 1/2) the rim is comfortable and forgiving. The cup bowl is reminiscent of some rotary trumpet mouthpieces. I've always loved those mouthpieces, but the backbores and end shanks are really not made for conventional piston trumpets. My mouthpieces are made to work with piston trumpets and still work really well in rotary trumpets! 
  • 1 1/2C: This is one of my best-selling mouthpieces and extremely comfortable compared to other manufacturers' "cookie cutter" rim contoured 1 1/2's.
  • 1.5 CB: Similar to the 1.25 CB with my ACB 1 1/2C rim

"Trent makes some ridiculously good mouthpieces. He's either a genius or completely lottery lucky on mouthpiece designs. His 1.25Orch model is to die for. Try it for yourself" -a satisfied customer

Classic "MV" diameter sized pieces (based on a great Bach Mt. Vernon rim): 

  • MV 1 1/4C: This is my modernized take on the Bach Mt. Vernon 1-1/4C mouthpiece. I match this piece with my O backbore and a slightly enlarged throat and throat entrance. It plays incredibly well and also has a very "classic" sound!
  • 665MC: Slightly larger than the MV 3C, this has a more efficient cup shape than on my MV 3C mouthpieces.
  • MV 3C: Another special mouthpiece
  • MV3CS: MV3C rim with my CS cup -- it's slightly smaller and also has a much more efficient entrance into the throat. This helps the articulation and adds a lively "zip" to the sound. This mouthpiece is especially good on vintage trumpets or overly dark horns to make them "speak." Paired with the MO backbore for a balanced feel.

"I have the MV3C and the MV3L. Both have a great sound and are really easy to play." -Mario

Medium sized Standard Series Mouthpieces (.630-656)

  • 3: My take on a classic 1928 mouthpiece. I tweaked a bunch inside this mouthpiece and while it still retains the core sound the piece plays considerably more efficiently and consistently in all registers.
  • 3B: Same rim as on my 3C but with a medium deep B-shaped bowl. It's one of my most popular mouthpieces and has an incredibly warm tone!
  • 3C: My take on a fantastic Bach 3C mouthpiece from the late 60's; I have never played a 3C like it. I think the added mass and proper matching backbore make this a formidable all-around mouthpiece!
  • 3CS: Similar to the 3C except it's slightly smaller and has a much more efficient entrance into the throat. It helps the articulation and adds a lively "zip" to the sound. This mouthpiece is especially good on vintage trumpets or overly dark horns to make them "speak".
  • 5B: My modernized take on one of the finest mouthpieces ever made, the Bach New York 5B. I've made the ACB 5B mouthpiece much more efficient than the vintage counterpart while maintaining the great sound shape and spread. It's one of my most popular sizes.
  • 5C: Long considered a transitional mouthpiece for the student, I've spent a bunch on time on this piece as most of my earlier prototypes didn't make the cut. This mouthpiece has an incredibly rich tone with fantastic articulations and ease in all registers. It's a great, comfortable mouthpiece!

"I've given Trent's 3C mouthpiece a 5 star review in the past and thought I'd do the same for the 3CS that I'm currently playing... It's quite simply the most comfortable and most responsive 3C type mouthpiece I've ever played with a fat, warm core to the sound. It's just a super efficient design that sounds great, what else do you need in a mouthpiece! Thanks so much for all the great gear you've made available to the trumpet world, keep up the great work Trent!" -Ray

Smaller diameter Standard Series Mouthpieces:

  • 10 1/2C: While this is a fairly small diameter mouthpiece it produces a big tone, with a fine high register and resonating low register. I started with this piece thinking it would a good mouthpiece for students to start on, but I find it very good for all players, especially those with very thin lips and ones who want a bit more corner support.
  • 10CV: Another new addition to the line, this mouthpiece was made for folks who want a compact efficient commercial mouthpiece but who "bottom-out" on smaller pieces. This rim is very similar to an older Giardinelli 10 and the cup a medium shallow  hybrid v/bowl shape.  The result is a very good all-around show and commercial mouthpiece. It's also an excellent choice for jazz soloists looking for a piece for extended solo work.  
  • 1-27: This is my take on a fantastic vintage piece, the Al Cass 1-27. The cup and rim are loosely based off the Al Cass mouthpiece. I then used a slightly more aggressive entrance into the bowl of the mouthpiece and also a tighter backbore to make the piece zip even more. The inner diameter is around a 7C but with a round and comfortable rim. The cup volume is less than a 7C for sure, so this mouthpiece has a lot more efficiency and sparkle to the sound.
  • Lead 1.25: I've always loved the cup of the Marcinkiewicz Shew 1.25, and played on that mouthpiece for many years. I felt the piece's weight, straight throat, and backbore could be improved for my own use. I designed this mouthpiece to feel more forgiving (especially in this blank) and gained more core in the overall sound shape. This mouthpiece is a weapon for the commercial trumpet player!

"About a year ago, I switched to the ACB Lead 1. I have virtually played every brand on the market over the past 20 years and nothing has helped secure my playing like the Lead 1. The sound, articulation and projection is second to none. Trent is not only a first class musician but also a first class gentleman and businessman. Kudos to making equipment that works with you to maximize the musician within!" -a satisfied customer

TA Series (designed for my own personal playing needs)

  • TA1: The TA1 is a mouthpiece that I created to be my own “daily driver." I needed a comfortable rim and great efficiency for extended practice sessions and small group gigs, but I still wanted a rich sound with lots of character. It's based on one of my favorite vintage mouthpiece designs of all time, one made for Clark Terry. Clark's piece had a wonderful “vee” shape cup, incredibly efficient without making the tone brittle or strident. I incorporated the V-cup shape into my TA1, giving it both wonderful ease/efficiency and an incredible tone. I also made a few alterations and improvements, including a more comfortable rim, a larger inner diameter, and I blended the cup entrance to the throat a bit more to make the balance between cup and bore much more efficient. Please see the link for additional info: 
  • TA2: It has a cup design which while being fairly shallow bowl shaped has an efficient entrance into the bottom of the cup to make it very efficient without sounding brittle. The rim is semi-flat with good support and is close to a "3-ish" diameter (.664). The TA1 is still my primary piece and I find it fantastic for everything but lead and show playing. That's where the TA2 comes in for me. It feels like a great show mouthpiece. I remember one gig where I played it on some 3 horn Sinatra arrangements and it was great to solo on and then sizzles above high C without getting smaller in sound shape.  
  • TA-Lead: This is  a model I've created for my own lead mouthpiece use. This rim is extremely comfortable, similar to an old Giardinelli 10S mouthpiece but rounder and more forgiving. The cup depth is shallow enough for great compression yet produces an incredibly rich tone in all registers. Standard 28 throat and my "zip" backbore round out this model. It's a great lead mouthpiece for people who tend to "bottom out" on small cups.
  • TA-Screech: A new take on a classic piece... this is a very small, high compression mouthpiece that is surprisingly easy to play. 30 throat and "zip" backbore produces one of the most efficient lead mouthpieces I've ever played! 
  • TA-Z: The TA-Z (or "Zing") might be one of the most comfortable commercial mouthpieces I've designed that can still maintain a beautiful sound from Pedal C to Double C and above. It features a .625 diameter with a medium flat rim and shallow hybrid V/S cup.

"A quick review of the TA2: wow. Now for a more complete review. I really enjoyed it on my gig last night. It was so comfortable and easy to play. I also had to back off my mic a little bit. So much core and center to the sound that it just flew out the bell. It works so well with my [Bach Stradivarius] 43 it's ridiculous. Lots of brilliance to the sound without becoming harsh, especially in the middle and lower registers. It sounds cliche, but as someone who plays mostly bigger pieces for everything else, I've found my perfect lead/commercial piece! Thanks Trent!" -Rob

We have many backbore choices available!

Here is a list of our backbores in order of tightest to most open:

  • KA3: our newest commercial backbore and it is amazing! Feels almost like the throat is one size smaller due to the compression.
  • KA2: a very nice backbore with good zing.
  • KA1: more core than the A2 and a bit tighter as well.
  • A2: The A2 is a weapon! Designed to be mated with extreme compression mouthpieces, this might be the ultimate commercial backbore I've played. It works great above high C and mates with 27, and 28 tops extremely well!
  • T (Tight): commercial backbore which provides the most resistance and "zing" to your sound.
  • MT (Medium Tight): Provides great resistance, especially for players who tend to "back-up" with very tight commercial backbores.
  • S (Standard): Provides the best balance between resistance and sound spread for most players. 
  • MO (Medium Open): A great slightly open symphonic shape produces a rich, warm tone but still gives ample resistance when needed.  
  • A1: This backbore is a very large, symphonic backbore that is in between the MO and O but feels like it combines both feel and sound shapes from the two other shapes. It's  a wonderful backbore suited for the classical player or jazz soloist wishing for a large sound!
  • O (Open): This is a very large, open backbore designed for the orchestral musician to provide the feel and sound spread that most orchestral players prefer.
  • OO (Very Open): Huge backbore for enormous, rich sound (takes a lot of air).


Got a question about our mouthpiece offerings? Want to order a custom mouthpiece? Give us a call on the Mouthpiece Hotline (781) 816-9664 or email us!

Scroll down for some more reviews!

If you have additional questions send us an email

Prior to ordering please check our Shipping and Returns policy.

Also note weight indicated in the ad is shipping weight not actual weight of the item.


Austin Custom Brass,  ACB,  Trent Austin,  For sale, custom brass shop, custom trumpet,  Kansas City,  kc, kcmo, Trumpet, Cornet, Flugelhorn, Adams, Adams trumpet, Adamsfamily, mouthpiece, mouthpieces, custom mouthpiece, best trumpet, cheap trumpet, We have mouthpieces equivalet to the Laskey 84D, Warbuton 2D, Laskey 84B, Warbuton 2MD, Laskey 84C, Warbuton 2MC, Hickman GW, Bach 1X, Monette B1-1, 30's Bach NY1, Vincent Bach 1 mouthpiece, Laskey 80B, Haefer, Yamaha 16C4, Schilke 16C4, Bach Mount Vernon 1 1/4C, Curry 1.25BC, Bach 1 1/4C, Bach 1/4 C, Tilz 1 1/4CE, Monette B2, Monette B2S3, ACB 1.25C, MV 1-1/4C, Monette B2LD, Tilze 1 1/2E, Bach 1 1/2B, Monette B3, Curry 1.5BC, Warbuton 3MD, Bach 1.5C, Monette B3, Curry 1.5C, Warbuton 3MC, Bach 1.5C, Monette B3, GR 67, Monette B3L, Bach 1.5D, Mount Vernon 3C, GR 66.5, Mount Vernon 3B, BH3, Monette B4, Bach Mt. Vernon 3, Monette B4S, Bach Mt. Vernon 3D, Monette B4L, Bach 2 1/2C, Bach 3D/E, Curry 3DE., Monette B5L, Bach 3, Bach 3B, Monette B5, Bach 3, Warbuton 4MC, Schilke 14B, Monette B6s1, GR 65M, Pickett 5D, Monette BLM, GR 65M/S, Monette BL, GR 65S, Pickett 5E, New York Bach 5B, Pickett 5B, GR 74.7 MX, Bach 5B, Pickett 5C, Curry 5C, Monette B6, Giardinelli 7M, Bach 7D, Monette B7, Bach 7E, GR 64S, Giardinelli 7S, New York Bach 7, New York Bach 7B, Giardinelli 10M, Marcinkiewicz Shew 2, New York Bach 10 1/2C, Shew Yamaha Lead, Marcinkiewicz Shew 1, Giardinelli 10S, Schilke 14a4a, Monette B4L, Bach MV 3D, Marcinkiewicz Shew 1.75, Vintage Gustat Heim trumpet mouthpiece, Al-Cass 1-27, 


  • 5
    High Quality

    Posted by Jeff Henderson on 22nd Dec 2023

    I ordered a top in clear and it sounds and feels great.

  • 5
    No more allergy problems!

    Posted by Oliver on 14th Aug 2023

    I suffered for ten years with lip pain when playing for long periods and was at a loss for what to do about it. Silver and gold pieces were equally bad, so I figured it wasn’t a silver allergy. It was only because I stumbled on Trent’s video discussing his allergies that I thought to buy a cheap plastic mouthpiece and give it a try. It seemed to help, so I went ahead and bought an acrylic 3CS which I’ve been using now for about a year and a half. Not only has my lip pain pretty much disappeared and I'm able to play for much longer periods, but it’s also super easy to play, is really comfortable and sounds great. (I had a test done and it turns out it’s a nickel allergy.) I’ve also discovered that the acrylic pieces are much louder than metal pieces from the audience side, meaning I don’t have to work as hard to project over an ensemble. Soon after I ordered a custom pair of acrylic mouthpieces for cornet and flugelhorn (B cup for cornet and FD for flugel - both with a 15 throat, which is the standard size on British pieces), which I also love playing as they both play so well. Turns out the standard flugel taper didn’t fit my flugel, but they kept trying and I’ve now got a completely custom backbore that fits nicely. Josh was fantastic and helped me through the whole process through FaceTime and many emails. I’ve also recently purchased a one-piece MV3C with acrylic rim for orchestral work (for me the 3CS is great for jazz but a little bright for classical), which sounds fantastic and I’m looking forward to testing it out properly. I honestly can’t thank Trent and the team enough for their fantastic mouthpieces and great service - they really have saved my playing!

  • 5
    MV3C Acrylic: New Daily Driver

    Posted by Gareth Ramsey on 8th Aug 2023

    I was convinced almost immediately, but a couple weeks in I’m even more assured that the MV3C is my new go-to all-arounder. Standard 3C rims are not comfy for me, but this is comfy, I can get a great tone out of it, and my entire range feels smooth. Pairing it with a Pickett #2/27 backbore/throat but would like to try the ACB backs someday. Great design!

  • 5

    Posted by Gart Pollarf on 4th Dec 2022

    Shopping for a new mouthpiece? Contact Laura at Austin Custom Brass. I was looking for a new cornet mouthpiece and I thought I knew just what I wanted. I met Laura at the store; she listen to my request, asked me many questions, and brought me multiple samples to play on. After some time and Laura’s help I settled on my first acrylic mouthpiece. Let me tell you this has been a game changer for me. My sound is purer, my range is greater, and my endurance has increased greatly. If you’re looking to make changes in your equipment, check these guys out. Many thanks to Laura for her help and guidance!!!!!

  • 5
    Where have you been all my life?

    Posted by Gordon on 14th Oct 2022

    I used to think the flaking skin on my lips was due to the extra grip of silver over gold, but after testing myself for allergies it turned out that after 45 years of playing I am allergic to silver. I still have a bit of reaction to Gold, but playing gold plated mouthpieces has largely hidden this problem. I ordered the 0B because its similar to the size of mouthpiece I normally play. I played over three hours the first day, and was nearly I tears afterwards. No swelling, no rubbing skin cells off the mouthpiece, and the sound was really good too. I have played it in an orchestra and the sound was equivalent to a metal mouthpiece. I need to find a way of getting something equivalent for brass band cornet.

  • 5
    Instant relief and improvement

    Posted by No more red ring. on 20th Jun 2022

    For the past few months, I have been on a playing nosedive. My endurance was gone, and my low register vanished. I thought something serious was happening. I stumbled up a video of Trent's where he discussed his allergy issues, and realized that was me. The burning wasn't nerve damage, but rather it was irritation. I recently got my 5c, and after 20 minutes, I got my low register back, and it's been there ever since. The quality is topnotch, and service was fantastic. Only issue was some of the Warburton backbores didn't want to fit at first. They where both rather new, but my older backbore had no issues. Must try if you think you have allergy issues

  • 5
    1st impressions

    Posted by Mike Aldorfer on 2nd Nov 2021

    I would like to start by saying how gorgeous the wood grain is...Still getting used to how deep the MV3 is. But it plays with the rich, full sound I was looking for.

  • 5
    Great pieces!

    Posted by Ron Lander on 9th Oct 2021

    I have a couple of these now, in the Papa Bear and Bea bear sizes. I use them with a Bb cornet in Brass Band and other various sized brass ensembles. Tone is a little reduced compared to normal mouthpiece but for me this can be improved by opening the embouchure slightly and using a little more air. They also fit Warburton and Wedge shanks.

  • 5
    1.5 MV clear

    Posted by David Rivera on 12th Mar 2021

    Trying with high trumpets I found a great tool for D and Eb repertoire. Thanks to all the team that works here! #Acbassador in Mexico!