Detail 01
16.75mm cup diameter
Sits between the wide 2 (17mm) and the 4 (16.4mm). More flexibility and volume than a 4, less work than a 2.

Independent shopping perspective
Denis Wick Classic cornet mouthpiece, size 3, silver finish. Medium-large 16.75mm cup with a narrow rim and open backbore, for players chasing a dark, stable tone.

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
Sits between the wide 2 (17mm) and the 4 (16.4mm). More flexibility and volume than a 4, less work than a 2.
Detail 02
Narrow by this range's standards. Better slotting and flexibility, but less surface area, so endurance suffers on long sets.
Detail 03
The largest throat in the range. More air moves through, giving volume and a fatter sound but demanding more support.
Detail 04
Free-blowing with less resistance. The B models use a V backbore instead for more focus and brilliance up top.
Detail 05
Slicker and slightly brighter feeling on the lip than raw brass, and it resists corrosion from skin contact.
Detail 06
Standard-shape range where sizes step in consistent increments, so moving to a 4 or 2 is a predictable change.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
The 4 is smaller across the cup at 16.4mm with a wider 5.27mm rim and a deep, rich tone. The 3 is wider and freer-blowing, still dark but more open.
No. It's a cornet mouthpiece with a cornet shank. It won't seat properly in a trumpet leadpipe.
It suits it well — the dark tone and stability sit inside a section rather than over it. For solo cornet lead lines you may want the more focused 3B.
Same 16.75mm cup and 5.05mm rim. The 3B has a tighter 4.27mm throat and a V backbore, giving a brighter, more focused high register with more resistance.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.