Detail 01
16.5mm cup diameter
The narrowest in the series. Less lip inside the cup, so high notes and endurance come easier than on the MM1C.

Independent shopping perspective
Silver-plated trumpet mouthpiece with a 16.5mm cup, the tightest rim in the Maurice Murphy series. For players who want focus and projection over width.

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
The narrowest in the series. Less lip inside the cup, so high notes and endurance come easier than on the MM1C.
Detail 02
Same rim width across the whole series. Switching between MM sizes changes diameter, not how the rim feels on your lip.
Detail 03
Standard-ish opening shared across the series. Keeps back-pressure consistent if you swap cup sizes later.
Detail 04
Rounds off the top end and adds warmth, so the focused small cup does not turn brittle.
Detail 05
Slightly grippier on the lip than gold plating and easy to keep clean. Some players react to nickel under the plating.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
Cup diameter. The MM4C is 16.5mm and more focused with strong projection; the MM3C is 16.75mm, more versatile with a warmer, fuller sound.
The narrow 16.5mm cup and focused response favor stability and projection up high, which is what lead work asks for.
The MM1C at 17.5mm, followed by MM1.5C (17.25mm), MM2C (17mm), MM3C (16.75mm), then this MM4C at 16.5mm.
It is a trumpet mouthpiece and seats in a standard trumpet receiver. It will not fit a cornet or flugelhorn.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.