Bruno Tilz 231-C 4 vs Bruno Tilz 310-M 21
the Bruno Tilz 231-C 4 features a deeper cup, the Bruno Tilz 310-M 21 has a larger throat opening.
The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.
Mouthpiece A
Bruno Tilz 231-C 4
• Tuba
CatalogRim width—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Bruno Tilz 310-M 21
• Tuba
CatalogRim width—
Best suited for
High-volume projection — open throat for power
Which is better?
Both mouthpieces are categorized as "Catalog" — the physical dimensions above will determine which suits your embouchure and playing style better.