Bach 8½A vs Bach 8¾
Both mouthpieces share similar core dimensions — the differences are in the details.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 8½A
• Cornet
Cup diameter16.10 mm / 0.6339 in
vs
Mouthpiece B
Bach 8¾
• Cornet
Cup diameter16.10 mm / 0.6339 in
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 16.10 mm / 0.6339 in.
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.