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Kelly 5G-LS vs Yamaha SL-48L

The Kelly 5G-LS has a wider cup diameter, the Kelly 5G-LS 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
    Kelly 5G-LS
    • Trombone
    Orchestral
    Cup diameter25.40 mm / 1.0000 in
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    📋Symphonic trombone / euphonium
    vs
    Mouthpiece B
      Yamaha SL-48L
      • Trombone
      Cup diameter25.25 mm / 0.9941 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Kelly 5G-LS has a cup diameter of 25.40 mm / 1.0000 in compared to 25.25 mm / 0.9941 in on the Yamaha SL-48L — a difference of 0.15 mm / 0.0059 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 5G-LS details Yamaha SL-48L details Kelly 5G-LS equivalents Yamaha SL-48L equivalents

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