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Warburton are pleased to announce that due to so many people wanting a high quality one-piece trombone mouthpiece in sizes that they are familiar with, we have designed a complete line of one- piece trombone mouthpieces. While the numbering system is familiar, (using Bach nomenclature), each model has been designed to eliminate problems that have come to light over the years. We have made the rims more comfortable, and the throat sizes are balanced to the cups. The backbores are maximized for tone production and projection.