Kelly 7C-UK vs Marcinkiewicz 10
The Marcinkiewicz 10 has a wider cup diameter, the Marcinkiewicz 10 features a deeper cup, the Marcinkiewicz 10 has a larger throat opening.
Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.
Mouthpiece A
Kelly 7C-UK
• Cornet
GeneralMaterialLexan polycarbonate
Best suited for
All-round versatile — balanced cup for general playing
Comfortable music-industry standard
vs
Mouthpiece B
Marcinkiewicz 10
• Cornet
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
Material
The Kelly 7C-UK is described as Lexan polycarbonate, and the Marcinkiewicz 10 as unspecified. Material affects mass, warmth, and how quickly the piece responds.
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.