Yamaha trombone/euphonium mouthpiece. This is a small shank. Please note. There are no major deformations, but it is a used item, so there are many small scratches. There is no box, so it will be wrapped in cushioning material for shipping. Mouthpiece, silver-plated finish, small shank Rim inner diameter: 25.23 Throat diameter: 6.92 It has a slightly shallower cup than the 51, allowing for powerful playing at high volumes. With a rich sound across the entire range, it is suitable for symphony orchestra players.