Custom descant horn features light, responsive action. Key of Bb/F alto, .472" bore, detachable 12-1/8" yellow brass bell with medium bell throat, gold brass mouthpipe, 4 solid rotary valves, 5th rotary A/plus stop valve eliminates transposition and puts horn into key of A, nickel silver inner and outer slides, unlacquered brass enhances natural sonic characteristics, engraved valve caps, handmade construction. Includes case, HR30C4 mouthpiece, and premium rotor oil. All Yamaha wind instruments come with a limited 5-year warranty.