Marcinkiewicz 11C mouthpiece for trombone, small shank, outside cup diameter 38,61 mm (1,520in.), inside cup diameter 25,37 mm (0,999 in.), cup depth 22,05 mm (0,868 in.), drill venturi 5,94 mm (0,234 in.), length 80,52 mm (3,170 in.), silver plated, comparsion only with Bach 11C