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Denis Wick 5AL vs Kelly 12C

The Denis Wick 5AL has a wider cup diameter, the Denis Wick 5AL 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 5AL
    • Trombone
    Cup diameter25.73 mm / 1.0130 in
    Best suited for
    📣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 5AL has a cup diameter of 25.73 mm / 1.0130 in compared to 24.13 mm / 0.9500 in on the Kelly 12C — a difference of 1.60 mm / 0.0630 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 5AL details Kelly 12C details Denis Wick 5AL equivalents Kelly 12C equivalents

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