Conn Precision 4 vs Kelly 5C
The Kelly 5C has a wider cup diameter, the Kelly 5C features a deeper cup.
Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.
Mouthpiece A
Conn Precision 4
• Cornet
GeneralMaterialSilver-plated brass
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 5C
• Cornet
GeneralMaterialLexan polycarbonate
Best suited for
High-volume projection — open throat for power
Mid-range all-purpose
Material
The Conn Precision 4 is described as Silver-plated brass, and the Kelly 5C as Lexan polycarbonate. Material affects mass, warmth, and how quickly the piece responds.
Which is better?
Both mouthpieces are categorized as "General" — the physical dimensions above will determine which suits your embouchure and playing style better.