Perantucci PT-82 Tuba Mouthpiece, cup diameter: 32,5 mm, moderately shallow, very round cup, rim: 8,0 mm, rounded rim with slightly sharp inner edge, bore: 8,2 mm. Model PT-82 is a high-dynamic range, German style mouthpiece, especially designed for large or otherwise mellow sounding instruments. The low register response is particularly good.