Which has a bigger cup — Bach 10½C or Bach 11C?

The Bach 10½C has a cup diameter of 15.90 mm / 0.6260 in compared to 15.70 mm / 0.6181 in on the Bach 11C — a difference of 0.20 mm / 0.0079 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 10½C and Bach 11C?

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

Bach 10½C vs Bach 11C

Name: Bach 11C
Brand: Bach

The Bach 10½C has a wider cup diameter.

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

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 10½C

• Cornet

Rim width—

Mouthpiece B

Bach 11C

• Cornet

Rim width—

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.