PERANTUCCI Tuba Mouthpiece I purchased this in excellent condition, but I haven't used it, so I'm putting it up for sale. Cup Characteristics: Diameter: 32.0mm Medium depth, very round Rim Characteristics: Width: 8.5mm Very round Throat Bore: Diameter: 7.8mm Features: The PT-65 model is basically similar to the PT-64, with a strong core and accurate intonation across all registers, but with a deeper tone than the PT-64. It is characterized by its quick response, accurate intonation, and flexibility, making it suitable for modern F tubas with large bores and the performance of highly difficult contemporary pieces. The PT-64 model has a clear, core sound and can produce a vibrant, emotionally moving, beautiful tone. It is versatile and, when combined with a CC tuba, creates an extraordinary tone. Especially when combined with an F tuba or E♭ tuba, it produces a powerful, grand sound, making it effective for solo performances with ensembles or for playing high-range orchestral pieces.