Perantucci PT-83+ Tuba Mouthpiece - heavy model, 32.0mm cup diameter, medium deep funnel, 7.5mm rim, fairly sharp inner edge, moderately round rim, 8.60mm bore, a distinct but dark sound in all registers for players who prefer a moderately wide cup, quick response, designed for use with C and Bb tubas, available in both regular and heavy shell PT-83+ versions.