GR 66M — medium cup, Bach 3C area. GR 66MS — shallower (lead/commercial). GR 66MD — deeper variant in the 66 family.
- GR 66M specs
- GR 66MS specs
- GR 66MX (related model)
Compare any two GR or Bach models with measured cup diameter and depth.
GR 66M vs 66MS vs 66MD Trumpet Mouthpieces — Compared
GR 66 series trumpet mouthpieces 66M, 66MS, and 66MD explained with specs and Bach equivalents. Compare GR models side-by-side.