Thank you for viewing. This is a JK tuba mouthpiece, a signature model for B♭/C tubas by Alexander von Puttkamer, tuba player of the Berlin Philharmonic. Please be aware that, as shown in the third photo, there are areas where the plating did not adhere during the manufacturing process. This is a used item, so there are small scratches, but there are no dents on the shank. The size is: Inner rim diameter: 33.0mm (actual measurement) Throat diameter: 9.0mm (actual measurement) Weight: 185g (light) / 206g (heavy) Cup: Very deep U/V hybrid cup Shank: American Information reprinted from the Tuba Man Plus website. Thank you for your consideration.