Courtois Trombone Mouthpiece 6 1/2 (Half) M SP 中古品 (Used) This mouthpiece was supervised by the world-renowned trombone player, Michel Becquet. It features a large cup and bore, and a solid rim. It produces power and a rich, deep sound. There are some scratches on the shank, but otherwise, there are no noticeable scratches. Specifications: 6 1/2M Cup Inner Diameter: 25.40mm Rim Width: 7.50mm Bore Size: 6.55mm Depth: ML Original Price: 16,500 yen Thank you for viewing.