Perantucci PT-24+ Tuba Mouthpiece, heavy weight, cup diameter: 31 mm, moderately deep, well rounded at bottom, rim: 10 mm, wide cushion rim, well rounded inner and outer edge, bore: 9 mm, an excellent general purpose mouthpiece for F, Eb, CC and BBb tubas featuring a comfortable rim and a large throat bore for depth of tone and volume. Optimized for solid sound with good projection and accurate response in all registers