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Bruno Tilz 214-D 5 vs Kelly 5G

The Bruno Tilz 214-D 5 has a wider cup diameter, the Kelly 5G 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
    Bruno Tilz 214-D 5
    • Trombone
    Catalog
    Cup diameter26.00 mm / 1.0236 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Kelly 5G
      • Trombone
      Orchestral
      Cup diameter25.40 mm / 1.0000 in
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📋Symphonic trombone

      Cup Diameter

      The Bruno Tilz 214-D 5 has a cup diameter of 26.00 mm / 1.0236 in compared to 25.40 mm / 1.0000 in on the Kelly 5G — a difference of 0.60 mm / 0.0236 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Which is better?

      The Bruno Tilz 214-D 5 is designed for catalog playing, while the Kelly 5G targets orchestral use. Your best choice depends on your musical context.

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