GR Compu-Bal trumpet mouthpiece 64 rim
GR Compu-Bal trumpet mouthpiece 64 rim - 64S is backordered and will ship as soon as it is back in stock.
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Quick Comparison - The GR 64 Series cup diameter is somewhat similar to a conventional 7 diameter. Classic Blank is standard. Studio, Symphonic, and FatBoy are available as a special order on some models.
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