Detail 01
14C4 size
Yamaha equates it to a Giardinelli 5C. Medium cup, medium rim, no bias toward high or low register.

Independent shopping perspective
Yamaha's standard trumpet mouthpiece in a medium cup and rim. A common step up from a stock student mouthpiece, and a reference point for finding your size.

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
Yamaha equates it to a Giardinelli 5C. Medium cup, medium rim, no bias toward high or low register.
Detail 02
The C cup depth and 4 backbore are Yamaha's most common pairing, so response stays even across the range.
Detail 03
Lets you jump sideways to a shallower A cup or deeper E cup while keeping a rim you already know.
Detail 04
Machined to Yamaha's production spec. Consistent unit to unit, which matters if you replace a lost mouthpiece.
Detail 05
Fits Bb, C and piccolo trumpets and most cornets take a different shank, so check before assuming it swaps over.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
Yamaha lists the 14C4 as comparable to a Giardinelli 5C. For Bach equivalents in the same line, the 11C4 matches a Bach 7C and the 14B4 matches a Bach 3C.
Yes. It is a standard medium size that works for concert band and lessons, and it gives a teacher a known reference point to adjust from.
No. This is a trumpet shank. Cornets use a different taper, so you need a cornet mouthpiece instead.
Shallower cups like the A and B series favor upper register and brightness. Deeper cups like the D and E series favor low register and a darker sound.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.