3 Series: .660" / 16.76mm
3 Series Rim
The GR 3 Series Rim has a slightly flatter feel than the GR Standard rim.
It may have a familiar feel to conventional 3 players but with GR improvements in comfort and articulations.
All 3 Series Mouthpieces have the same alpha angle.
The bite is softer than the Standard GR Rim and GR E-Rim.
The larger bite radius may make the rim feel larger.
The outside diameter is slightly narrower than the Standard GR Rim.
This is a generous rim with excellent grip and support.
3M - #2 backbore, medium small (0.0806") cup volume, Semi flat rim contour, medium soft bite, medium alpha angle
Quick Comparison - The GR 3M is GRs answer to the very popular bach 3C mouthpiece. The 3M's closest true GR is a 66M but features a slightly wider rim giving a feel similar to the bach. Widely used for Bb,C and Eb trumpet work. As the trend in player is moving towards slightly smaller rims mouthpieces, this is becoming a very popular model.