Perantucci PT-65 Tuba Mouthpiece, cup diameter: 32 mm, medium depth, strongly round, rim: 8,5 mm, rounded with well defined inner Contact point, bore: 7,8 mm. Model PT-65 is similar to the PT-64, on which it is based. The PT-65 provides a strong center and great accuracy in all ranges just as the PT-64 does but with a different tonal nature.. The center is clear and dominating yet dark in character. The response, the accuracy, the flexibility, the tonal nature of this new model accomodates modern large bore instruments and demanding contemporary literature. A Perantucci Best-Seller!