BBb-Tuba, bell 45 cm, 5 valves , Model 86B (186 5V), 440 Hz, Bell diameter 450 mm (17,717 inch), rotary valves, nickel silver trimmings, spiral spring system, Bore of valve section 19,6 mm (0,772 inch), brass body, nickel silver wreath, Material of mouthpipe nickel silver, Mouthpiece TU29, lacquered