The Bach LR180S-37 Stradivarius Professional Trumpet is in the key of Bb. Lightweight body, .459" medium-large bore, standard weight 37 bell, 25LR (reverse) mouthpipe, Monel valves, silver-plated finish. Please Note: All Bach trumpets and cornets come with 1st valve slide hook, 3rd valve slide ring, case, and mouthpiece, unless otherwise specified.