Curry 1 BBC vs Kelly 3C
The Curry 1 BBC has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Curry 1 BBC
• Cornet
Cup diameter17.27 mm / 0.6800 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Kelly 3C
• Cornet
GeneralCup diameter17.02 mm / 0.6701 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
All-purpose mid-range
Cup Diameter
The Curry 1 BBC has a cup diameter of 17.27 mm / 0.6800 in compared to 17.02 mm / 0.6701 in on the Kelly 3C — a difference of 0.25 mm / 0.0099 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.