Marcinkiewicz 15 mouthpiece for trombone, small shank, outside cup diameter 38,10 mm (1,500in.), inside cup diameter 25,10 mm (0,988 in.), cup depth 20,47 mm (0,806 in.), drill venturi 5,94 mm (0,234 in.), length 80,52 mm (3,170 in.), silver plated, comparsion only with Bach 15C