BBb-Tuba, bell 47 cm, 4 valves , Model 289A, Bell diameter 470 mm (18,504 inch), rotary valves, ergonomic, nickel silver trimmings, spiral spring system, Bore of valve section conical 20,4 - 21,2 mm (0,803 - 0,835 inch), brass body, nickel silver wreath, Material of mouthpipe nickel silver, Mouthpiece TU33, lacquered