BrassLab.MOMO Tuba Mouthpiece 65F - For F/Eb Tubas This is a slightly deeper version of the 64F cup. It's based on the popular Perantucci PT-65 model. Inner Rim Diameter: 32.0mm Throat Diameter: 7.8mm Cup: Slightly shallow U-cup Please check the condition in the photos. If you have any questions or concerns, please feel free to comment. Please consider this item as used. It will be packaged with cushioning material and shipped. Tuba Tuba tuba Mouthpiece Mouthpiece