Yamaha Trombone Mouthpiece 51C4L for large bore, silver-plated finish. New retail price: 9900 yen (tax included) Rim inner diameter: 25.23 mm Throat diameter: 6.92 mm Features: Has a slightly shallower cup than the 51, allowing for powerful playing at high volumes. Produces a full sound across all registers, suitable for symphony orchestra players. Used for a few months after purchase and then stored. Please check the condition in the images. No box, mouthpiece only.