This is a mouthpiece for a contrabass trombone. It's a KBP3C, which is the smallest model. Rim diameter: 29.00mm Shank: 12.5mm (bass trombone shank) → Suitable for Chinese-made instruments. Used a few times, there are some marks on the shank, but it's clean with no noticeable scratches. Currently, it takes 2-3 months from order and costs around 17,000 yen. If you're interested, please consider it. Sticker and mouthpiece brush included. #trombone #contrabass trombone