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Conn Precision 3 vs Kelly 5C

The Kelly 5C has a wider cup diameter, the Kelly 5C features a deeper cup.

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
    Conn Precision 3
    • Cornet
    General
    Cup diameter16.41 mm / 0.6461 in
    Best suited for
    🎵All-round versatile — balanced cup for general playing
    📋All-around use; most popular model
    🎶Bright quality of tone in all registers; good all-around
    vs
    Mouthpiece B
      Kelly 5C
      • Cornet
      General
      Cup diameter16.76 mm / 0.6598 in
      Best suited for
      📣High-volume projection — open throat for power
      📋Mid-range all-purpose

      Cup Diameter

      The Kelly 5C has a cup diameter of 16.76 mm / 0.6598 in compared to 16.41 mm / 0.6461 in on the Conn Precision 3 — a difference of 0.35 mm / 0.0138 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Which is better?

      Both mouthpieces are categorized as "General" — the physical dimensions above will determine which suits your embouchure and playing style better.

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