Miraphone Tuba Mouthpiece TU28 Thank you for viewing. I purchased this at a musical instrument store in Tokyo last April. The purchase price was approximately 31,000 yen (the price increase was insane!). I used it for about two months, but I'm now using a different mouthpiece, so I'm putting this up for sale. This is a versatile mouthpiece that produces a light, compact, and tight sound, suitable not only for F and E♭ tubas, but also for C and B♭ tubas. Thank you very much. Rim Inner Diameter: 32.9 mm Outer Diameter: 48.2 mm Depth: 37.9 mm Throat Diameter: 8.2 mm American Shank