Miraphone CC-90 B C-Tuba, 5 valves, bell diameter: 500 mm (19,685 inch) 5/4 rotary valves bore of valve section: 21,2 mm (0,835") nickel silver trimmings, spiral spring system, Miraphone minibal rod brass body, nickel silver wreath material of mouthpipe: nickel silver, mouthpiece: TU33 lacquered without case