B&S 3131/2-S Challenger II, High-Bb/A-trumpet, brass silver plated, Handhammered one piece bell, Boxed bronce springs, Challenger Monel pistons, Nickel silver outer slides, Trigger at the 3rd valve slide, Bb-and A-leadpipe, Bore: 11.8 mm (0.465"), Bell diameter: 100 mm (3.937"), inlk. case and mouthpiece.