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| Trumpet | Rim mm | Rim in |
| 1 GW | 17.29 | 0.681 |
| David Hickman | 17.25 | 0.68 |
| 1.25 GW | 17.09 | 0.673 |
| 1.5 GW | 16.89 | 0.665 |
| 3 GW | 16.58 | 0.653 |
| 5 GW | 16.4 | 0.646 |
| 7 GW | 16.35 | 0.64 |
| Gill Kaupp | 16.00 | 0.63 |
| 10 GW | 16 | 0.63 |
| Lead J,S,Z | 16 | 0.63 |
| French Horn | Rim Diameter | Throat | Cup Depth | Rim Width |
| FH-5 | 0.668 | 0.228 | 1.155 | 0.135 |
| FH-1 | 0.678 | 0.165 | 0.787 | 0.152 |
| FH-1.5 | 0.678 | 0.185 | 0.787 | 0.152 |
| FH-2.5 | 0.679 | 0.175 | 0.995 | 0.152 |
| FH-2.75 | 0.679 | 0.185 | 0.995 | 0.152 |
| FH-200 | 0.685 | 0.18 | 0.985 | 0.15 |
| FH-2 | 0.685 | 0.183 | 1.025 | 0.151 |
| FH-3 | 0.7 | 0.173 | 1.05 | 0.142 |
| FH-3.25 | 0.7 | 0.185 | 1.05 | 0.142 |
| FH 3.5 | 0.7 | 0.173 | 1.01 | 0.14 |
| FH-3.75 | 0.7 | 0.185 | 1.01 | 0.14 |
| FH-4.25 | 0.705 | 0.173 | 1.045 | 0.138 |
| FH-4.5 | 0.705 | 0.185 | 1.045 | 0.138 |
| FH-310 | 0.705 | 0.182 | 1.2 | 0.156 |
| Small Bore Trombone | Rim Diameter | Throat | Cup Depth | Rim Width |
| Almont | 0.955 | 0.23 | 0.87 | 0.305 |
| Orchestral Alto | 1.022 | .215 | 0.905 | 0.262 |
| Reggie Young | 0.954 | 0.236 | 1.035 | 0.275 |
| GWC-958 | 0.958 | 0.232 | .884 | 0.272 |
| Bacchus | 0.992 | 0.231 | 0.83 | 0.255 |
| Chocolatero | 0.96 | 0.231 | 0.895 | 0.275 |
| Barber | 0.975 | 0.231 | 0.935 | 0.268 |
| Chubasco | 0.985 | 0.231 | 0.965 | 0.257 |
| Ron Wilkins | 0.997 | 0.232 | 0.945 | 0.262 |
| GWC-100 | 1 | 0.23 | 0.945 | 0.265 |
| Harry Watters | 1 | 0.259 | 0.975 | 0.277 |
| GWC-101 | 1.01 | 0.232 | 0.925 | 0.275 |
| Joseph Jefferson | 1.012 | 0.263 | 1.15 | 0.261 |
| Tenor/Euphonium | Rim Diameter | Throat | Cup Depth | Rim Width |
| Hiram Diaz | .9896 | 0.278 | 1.303 | 0.282 |
| NB-100 | 1 | 0.278 | 1.005 | 0.25 |
| GW-100 | 1 | 0.282 | 1.175 | 0.25 |
| Sonny Ausman | 1.008 | 0.264 | 1.15 | 0.285 |
| Euros | 1.008 | 0.282 | 1.09 | 0.242 |
| Boreas | 1.008 | 0.283 | 1.115 | 0.242 |
| NB-101 | 1.01 | 0.276 | 1.005 | 0.25 |
| GW-101 | 1.01 | 0.276 | 1.18 | 0.25 |
| Seiji Nakazawa | 1.015 | 0.234 | 1.005 | 0.25 |
| Kadja | 1.012 | 0.285 | 1.245 | 0.245 |
| SA-100 | 1.02 | 0.26 | 1.14 | 0.235 |
| NB-102 | 1.02 | 0.276 | 1.005 | 0.25 |
| GW-102 | 1.02 | 0.281 | 1.185 | 0.25 |
| DJNV | 1.02 | 0.272 | 1.029 | 0.265 |
| Carbonaria | 1.021 | 0.3 | 1.275 | 0.265 |
| Joe Jefferson | 1.022 | 0.263 | 1.24 | 0.263 |
| E-1 | 1.027 | 0.281 | 1.004 | 0.27 |
| EXL | 1.027 | 0.290 | 1.004 | 0.27 |
| GW-103 | 1.03 | 0.284 | 1.185 | 0.25 |
| DHWA-E | 1.032 | 0.288 | 1.255 | 0.272 |
| DHWA-S | 1.032 | 0.288 | 1.195 | 0.272 |
| TZ-103 | 1.035 | 0.279 | 1.025 | 0.235 |
| E-2 | 1.045 | 0.28 | 1.035 | 0.255 |
| Ruach | 1.06 | 0.281 | 1.18 | 0.243 |
| Ron Wilkins | 1.063 | 0.282 | 1.002 | 0.255 |
| Bass Trombone | Rim Diameter | Throat | Cup Depth | Rim Width |
| Adriano | 1.0958 | 0.302 | 1.445 | 0.269 |
| Mark-1 | 1.0958 | 0.295 | 1.268 | 0.270 |
| Karif | 1.135 | 0.302 | 1.275 | 0.25 |
| V-Max | 1.12 | 0.321 | 1.20 | 0.25 |
| Daniel Morris | 1.12 | .312 | 1.36 | 0.235 |
| Chinook | 1.14 | 0.304 | 1.295 | 0.25 |
| Don Harwood | 1.14 | 0.312 | 1.325 | 0.237 |
| Scirocco | 1.112 | 0.302 | 1.27 | 0.25 |
| Bob Sanders | 1.14 | 0.319 | 1.295 | 0.25 |
| NY-S | 1.141 | 0.303 | 1.09 | 0.235 |
| NY-O | 1.141 | 0.312 | 1.155 | 0.235 |
| DH-100 | 1.15 | 0.31 | 1.35 | 0.245 |
| D.Mirvil 5 | 1.143 | 0.312 | 1.35 | 0.210 |
| Nor'Easter | 1.144 | 0.319 | 1.345 | 0.235 |
| Bob Sanders Contra | 1.22 | 0.321 | 1.42 | 0.251 |
|
Tuba |
Inner Rim Diameter |
Throat |
Cup Depth |
Use |
|
1.320 |
.332 |
Deep Funnel |
Large ensemble, dark rich tone |
|
|
1.320 |
.318 |
Medium Deep Cup |
Large ensemble, clearer upper overtones |
|
|
1.295 |
.325 |
Deep Funnel |
Large ensemble, dark rich tone |
|
|
1.280 |
.325 |
Deep Funnel tighter back bore than Taku |
Large ensemble purer upper over tones |
|
|
1.295 |
.318 |
Medium Depth Funnel |
A work horse that can do it all equally well similar to Helleberg 7 slightly larger inner rim |
|
|
1.260 |
.318 |
Deep Funnel |
Well rounded mouthpiece simmilar to Helleberg 7b slightly larger inner rim great for solos, and chamber ensemble |
|
|
1.255 |
.318 |
Shallow Cup |
Great for solos and quintet |
|
|
1.255 |
.318 |
Very Shallow Cup |
Great for extended high playing an solos |
|
|
1.268 |
.305 |
Medium Shallow Cup |
Great for orchestral solo F tuba |
|
|
1.290 |
.335 |
Medium Deep Funnel Cup |
Awesome for orchestral CC tuba parts |
|
| Alessandro Fossi Cimbasso | 1.267 | .295 | Shallow cup | Perfect Italian Cimbasso Piece |
|
1.295 |
.321 |
Medium Funnel |
Great for orchestral playing and large ensembles |
|
|
1.295 |
.295 |
Shallow Cup |
Great for orchestral and solo playing |
|
|
1.295 |
.295 |
Shallow Cup wide mouth of throat |
Great for quintet and chamber groups |
|
|
1.295 |
.295 |
Medium Cup Depth |
Best for Chamber group and all a very versatile piece |
|
|
1.295 |
.295 |
Very shallow F Cup |
Great for solo playing |
|
|
1.310 |
.321 |
Deep Funnel Cup |
Great for orchestral work |
|
|
1.320 |
.332 |
Very Deep Funnel Cup |
Great for projection and clarity |
|
|
1.320 |
.332 |
Very Deep Funnel Cup |
Best in a large ensemble on bombastic low excerpts |
|
|
1.295 |
.295 |
Medium Shallow Cup |
Best in a large ensemble playing bombastic F tuba orchestral parts |
|
|
1.265 |
.316 |
Medium Deep Cup |
Very Versatile Mouthpiece based on Helleberg 7B |
|
|
1.295 |
.318 |
Medium Deep Cup |
Very Versatile mouthpiece great for all playing needs |
|
|
1.295 |
.321 |
Medium Deep Cup |
Great for Quintet, solos, and small ensembles |
|
| Jon Gross | 1.308 | .295 | Shallow | Punches out the bass line! |
| Hawk | 1.271 | .295 | Medium Cup | Fantastic Solo Tuba |
| Tempest | 1.289 | .300 | Medium Deep |
Do all Mouthpiece |
| TubaRed | 1.284 | .300 | Medium | Powerful sousaphone mouthpiece |
| Chris Hardy | 1.295 | .295-.318 | Contra and Bass tuba | Medium heavy weight Design |
Hiram Diaz Signature Euphonium Mouthpiece – The Solo Spotlight
Designed for Gunnery Sgt. Hiram Diaz, Assistant Principal Euphonium, "The President's Own" United States Marine Band
Premium Stainless Steel Construction | Cup Diameter: approx. 0.9896" | Throat: 0.278" | Cup Depth: 1.303"
Crafted in close collaboration with Hiram Diaz — one of the most celebrated euphoniumists in the world, a second-generation Cuban-American powerhouse, and a key voice in the legendary President's Own United States Marine Band since 2012 — this signature mouthpiece is engineered for the moments that matter most: high, extended solos that demand to be heard, felt, and remembered. While Hiram's daily setup handles the full spectrum of Marine Band duties (concerts, ceremonies, marches, and more), this mouthpiece is his specialized solo dominator — the one he reaches for when the spotlight shines, the melody soars into the stratosphere, and every note needs to project with crystal-clear resonance, pure tone, and uncompromising clarity. The refined geometry delivers effortless upper-register access, a singing lyrical quality, and a focused core that blooms beautifully in any hall — whether performing virtuosic concertos, lyrical features, or standout passages in the nation's premier military ensemble.
Why this mouthpiece elevates your playing:
Hiram Diaz doesn't just play euphonium — he inspires. This mouthpiece captures that same artistry: built for players who want to step into the light, deliver extended, soaring lines with confidence, and leave every listener moved by a sound that's pure, powerful, and unforgettable. If you're chasing solo brilliance — whether in recitals, concerts, competitions — the Hiram Diaz Signature is your go-to.
We carefully pack every mouthpiece to ensure it arrives in perfect condition. Orders are processed within 1–2 business days and shipped with tracking provided once dispatched.
If you're not completely satisfied, returns are accepted within 14 days of delivery. Items must be unused and in original condition.
For any shipping or return inquiries, please contact our support team — we’re happy to help. CONTACT US
Collections: Euphonium , Signature , Tenor Trombone , Trombone
Category: Euphonium , Signature , Tenor Trombone , Trombone
Type: Euphonium
Driven by a deep passion to enhance response, articulation, and overall playing ease, Ivan Giddings channeled his extensive understanding of brass performance into innovating mouthpiece design. Starting with just an idea to create better mouthpieces, his relentless drive led to the development of truly unique designs that prioritize superior playability and sound.
are made from the finest surgical Stainless Steel and Titanium available
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