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GR Technologies 3M vs GR Technologies 66M

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 narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
    GR Technologies 3M
    • Trumpet
    Throat diameter—
    vs
    Mouthpiece B
      GR Technologies 66M
      • Trumpet
      Throat diameter—

      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.

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