Bach 12 vs Bach 18C
The Bach 12 has a wider cup diameter, the Bach 12 features a deeper cup.
The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.
Mouthpiece A
Bach 12
• Cornet
Rim width—
vs
Mouthpiece B
Bach 18C
• 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.