B&S; 3137/2LR-S Challenger II S, Bb Trumpet, Brass body, ML bore: 11.66 mm, One-piece, hand hammered brass bell Ø: 125 mm, Monel valves, Reversed LR mouth pipe, Nickel silver outer slides, Slide stop on the 3rd slide, 2 Water keys, Silver-plated, Incl. mouthpiece and Prestige case