Bach 341 Trombone Mouthpiece 4G, Mouthpiece for Trombone, Versatile mouthpiece with a large diameter, particularly useful when only one trombone is used for both the high and very low registers, Wide shank, Identical rim shape and diameter as mouthpiece no. 4, Cup diameter: 26.00 mm, Cup depth: Deep, Bore: 7 mm, Backbore: #429, Silver-plated
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