Which has a bigger cup — Bach 2C or Kelly 7C?

The Kelly 7C has a cup diameter of 16.51 mm / 0.6500 in compared to 16.50 mm / 0.6496 in on the Bach 2C — a difference of 0.01 mm / 0.0004 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 2C and Kelly 7C?

Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.

Bach 2C vs Kelly 7C

Name: Kelly 7C
Brand: Kelly

The Kelly 7C has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

Surface plating or treatment (e.g. silver plate, gold trim). Affects feel, durability, and appearance.

Mouthpiece A

Bach 2C

• Cornet

Finish—

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

Kelly 7C

• Cornet

General

Finish—

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Beginner / intermediate

Which is better?

Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.