Marcinkiewicz 7C mouthpiece for trombone, small shank, outside cup diameter 37,77 mm (1,487in.), inside cup diameter 25,12 mm (0,989 in.), cup depth 22,02 mm (0,867 in.), drill venturi 5,94 mm (0,234 in.), length 80,52 mm (3,170 in.), silver plated, comparsion only with Bach 7C