Key of Bb. .484"-.490" dual bore, 7-1/2" one-piece bell, gold brass mouthpipe, one-piece, chromeplated nickel silver inner slide, yellow brass outer slide, hand-lapped tuning slide, slide lock, detachable balance weight, gold lacquer finish. Includes mouthpiece, slide cream, and wood case. All Yamaha wind instruments come with a limited 5-year warranty.