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Denis Wick 1AL vs Kelly 12C

The Denis Wick 1AL has a wider cup diameter, the Denis Wick 1AL 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
    Denis Wick 1AL
    • Trombone
    Cup diameter27.11 mm / 1.0673 in
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Kelly 12C
      • Trombone
      Lead
      Cup diameter24.13 mm / 0.9500 in
      Best suited for
      📋Lead trombone; smallest cup

      Cup Diameter

      The Denis Wick 1AL has a cup diameter of 27.11 mm / 1.0673 in compared to 24.13 mm / 0.9500 in on the Kelly 12C — a difference of 2.98 mm / 0.1173 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 Denis Wick 1AL details Kelly 12C details Denis Wick 1AL equivalents Kelly 12C equivalents

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