B&S Challenger 3131/2-L, high-Bb/A-trumpet, brass lacquered, 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"), incl. case and mouthpiece.