BBb-Tuba, bell 36 cm, 4 valves , Model 84A (184 4V), Bell diameter 360 mm (14,173 inch), rotary valves, nickel silver trimmings, spiral spring system, Bore of valve section 18,0 mm (0,709 inch), nickel silver wreath, brass body, Material of mouthpipe nickel silver, Mouthpiece TU21, lacquered