Which has a bigger cup — Bach 1½C or Bach 10½C?

The Bach 1½C has a cup diameter of 17.00 mm / 0.6693 in compared to 15.90 mm / 0.6260 in on the Bach 10½C — a difference of 1.10 mm / 0.0433 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 1½C and Bach 10½C?

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

Bach 1½C vs Bach 10½C

Name: Bach 10½C
Brand: Bach

The Bach 1½C has a wider cup diameter.

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

Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.

Mouthpiece A

Bach 1½C

• Cornet

Material—

Mouthpiece B

Bach 10½C

• Cornet

Material—

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.