Kelly 24AW vs Kelly 25
The Kelly 24AW has a wider cup diameter, the Kelly 24AW features a deeper cup.
The taper behind the throat leading to the shank. Affects projection and tone character.
Mouthpiece A
Kelly 24AW
• Tuba
GeneralBackboreXL
Best suited for
Orchestral playing — large cup for full, dark tone
Tuba / sousaphone
vs
Mouthpiece B
Kelly 25
• Tuba
GeneralBackboreM
Best suited for
General tuba / euphonium doubler
Which is better?
Both mouthpieces are categorized as "General" — the physical dimensions above will determine which suits your embouchure and playing style better.