Conn Precision 4 vs Kelly 7C
The Kelly 7C has a wider cup diameter.
The taper behind the throat leading to the shank. Affects projection and tone character.
Mouthpiece A
Conn Precision 4
• Cornet
GeneralBackbore—
Best suited for
All-round versatile — balanced cup for general playing
Players with large lips; close to Bach 2C/Schilke 16C4
Bright tone; same as Model 3 with wide rim
vs
Mouthpiece B
Kelly 7C
• Cornet
GeneralBackboreS
Best suited for
All-round versatile — balanced cup for general playing
Beginner / intermediate
Which is better?
Both mouthpieces are categorized as "General" — the physical dimensions above will determine which suits your embouchure and playing style better.