Trombone Mouthpiece for Tenor Trombone Willie's emperador Cup Inner Diameter: 24.7mm Bore Size: 6.3mm - 5.8mm Backbore: Stepped Barrel Shape Suggested Retail Price: ¥24,150 This is the signature model of trombonist Hideaki Nakaji. It is very well-made and I think it's an easy-to-play mouthpiece. There are scratches on the shank from attaching and detaching the instrument, and a small dent on the outer appearance of the cup (bottom of the cup in the first photo), so it is offered at a reduced price. I believe it will not affect the performance. Please understand that this is a used item before purchasing. ⭐︎Please also read the profile.