Warburton Trombone Mouthpiece TopsOur Two Piece Trombone Mouthpieces are based on the Warburton System known to trumpet players utilizing a separate Top and Backbore Section allowing the player to customize their equipment to best fit the playing context and personal preference. To ensure compatibility between models, all standard Tenor cups and backbores have a bore size of 0. 250". The ST series has a bore of 0. 266, and the B series has a bore of 0. 281". Different bore sizes are
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