Bach 7 vs Bach 8½BW
the Bach 7 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 7
• Trombone
Rim width—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bach 8½BW
• Trombone
Rim width—
Best suited for
High-volume projection — open throat for power
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.