Which has a bigger cup — Bach 10C or Bach 11C?

The Bach 10C has a cup diameter of 16.00 mm / 0.6299 in compared to 15.70 mm / 0.6181 in on the Bach 11C — a difference of 0.30 mm / 0.0118 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 10C and Bach 11C?

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

Bach 10C vs Bach 11C

Name: Bach 11C
Brand: Bach

The Bach 10C 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 10C

• Cornet

Finish—

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

Bach 11C

• Cornet

Finish—

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.