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Kelly 4B-UK vs Monette Cornet B2 FL

The Monette Cornet B2 FL has a wider cup diameter, the Kelly 4B-UK features a deeper cup, the Kelly 4B-UK has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
    Kelly 4B-UK
    • Cornet
    Orchestral
    Cup diameter16.51 mm / 0.6500 in
    Best suited for
    📣High-volume projection — open throat for power
    📋Professional cornet; British brass band
    vs
    Mouthpiece B
      Monette Cornet B2 FL
      • Cornet
      Cup diameter17.00 mm / 0.6693 in
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone

      Cup Diameter

      The Monette Cornet B2 FL has a cup diameter of 17.00 mm / 0.6693 in compared to 16.51 mm / 0.6500 in on the Kelly 4B-UK — a difference of 0.49 mm / 0.0193 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.

      Open in interactive tool + Add third mouthpiece Kelly 4B-UK details Monette Cornet B2 FL details Kelly 4B-UK equivalents Monette Cornet B2 FL equivalents

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