The GP Series mouthpieces feature an innovative shape and extra-heavy gold-plate finish for players who prefer a focused, concentrated tonal core. Horn Mouthpiece Specifications Model Rim Cup Depth Throat Backbore Playing Charateristics Inner Diameter Contour Thickness YAC HR30-GPR 17.08 mm standard standard standard (double-cup) 4.4 mm semi-narrow Smaller inner rim diameter than the 31. All-around type. Shallow "U" cup facilitates high notes, while a deep "V" makes low notes easy. YAC HR31-GPR 17.28 mm standard standard standard (double-cup) 4.4 mm semi-narrow Medium rim configuration provides flexibility for difficult passages. Relatively large throat delivers a heavy, somewhat dark tone with extra volume. YAC HR32-GPR 17.48 mm standard standard standard (double-cup) 4.4 mm semi-narrow Larger inner rim diameter than the 31. Authoritative low notes. Large cup volume for a rich, mellow tone.

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