Conn Imp. Precision 3 vs Kelly 3C
The Kelly 3C has a wider cup diameter, the Kelly 3C features a deeper cup.
Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.
Mouthpiece A
Conn Imp. Precision 3
• Cornet
GeneralMaterialSilver-plated brass
Best suited for
All-round versatile — balanced cup for general playing
Most popular model; all-around
Bright quality of tone in all registers
vs
Mouthpiece B
Kelly 3C
• Cornet
GeneralMaterialLexan polycarbonate
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
All-purpose mid-range
Material
The Conn Imp. Precision 3 is described as Silver-plated brass, and the Kelly 3C 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.