BBb-Tuba, compact style, front action, 5 valves , Model 1291, Bell diameter 470 mm (18,504 inch), piston valves, 5th valve = rotary valve, front action, nickel silver trimmings, Bore of valve section 21,2 mm (0,835 inch), brass body, Material of mouthpipe nickel silver, Mouthpiece TU33, lacquered