YAMAHA 64 tuba mouthpiece. There are scratches on the shank from when it was attached to the instrument. Please check the photos. Rim inner diameter: 30.45mm, Throat: 8.35mm American shank Despite its compact size, it has a sufficient cup volume, making it a stable mouthpiece for F tuba, both in the low and high registers. It has a size similar to the 1930s New York Bach 25, even more so than the current Bach 25, and its performance is particularly evident when playing melodies. #tubamouthpiece #tuba #tuba