Bach 12 vs Bach 12B
the Bach 12 features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 12
• Cornet
Cup diameter15.20 mm / 0.5984 in
vs
Mouthpiece B
Bach 12B
• Cornet
Cup diameter15.20 mm / 0.5984 in
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 15.20 mm / 0.5984 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.