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Bob Reeves RP4 vs GR Technologies 64Z**

Both mouthpieces share similar core dimensions — the differences are in the details.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.
Mouthpiece A
    Bob Reeves RP4
    • Trumpet
    Rim width—
    vs
    Mouthpiece B
      GR Technologies 64Z**
      • Trumpet
      Rim width—

      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 Bob Reeves RP4 details GR Technologies 64Z** details Bob Reeves RP4 equivalents GR Technologies 64Z** equivalents

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