Perantucci PT-88 Tuba Mouthpiece, cup diameter: 33,50 mm, wide, deep cup, rim: 7,0 mm, flat, well-defined inner edge, bore: 8,10 mm. The PT-88 along with the PT-50 constitute the most preferred and widely used large contrabass tuba mouthpieces in the Perantucci line. The cup is wider yet not as deep as that of the PT-50. The sound has great strength and depth. Recommended for strong players, those who desire great dynamic range and an immense sound. A Perantucci Best-Seller!