Detail 01
26mm cup diameter
Mid-size for the series — between the 25.73mm 5 and the 27mm 2. Balances endurance against low-note width.

Independent shopping perspective
Steven Mead signature euphonium mouthpiece, size 4, in silver. For players wanting an open, clear sound with a strong upper register.

Strong match
Consider the trade-offs
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
Mid-size for the series — between the 25.73mm 5 and the 27mm 2. Balances endurance against low-note width.
Detail 02
Funnel shape rather than a straight bore. Rounds the tone and softens the edge as you push volume.
Detail 03
Slightly open. Takes more air but rewards it with a fuller sound; a smaller throat feels more resistant.
Detail 04
Narrower rim. More flexible on slurs and range shifts, less cushion on long rehearsals.
Detail 05
The 4 comes both ways. Shank must match your leadpipe receiver or it will sit too deep or too shallow.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
Cup, rim, throat and backbore are identical at 26mm, 6.72mm and 7.38mm. Only the shank differs — SM4 is large shank, SM4M is medium.
The 3 is slightly wider at 26.40mm cup with a 6.80mm rim, aimed at solo projection and warmth. The 4 trades a little width for upper-register clarity.
The 7.38mm throat is on the open side, so it takes steady air. Coming from a tighter throat, expect to work on breath support at first.
It's cut for euphonium. Some baritones share a shank size, but the cup dimensions are designed around euphonium response.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.