Ideal for the doubler or to fill in the high school jazz band trombone section. An excellent horn for the amateur or professional. Key of Bb. .500" bore, 8" bell, gold brass mouthpipe, yellow brass outer slide, nickel plated pistons, detachable balance weight, lacquer finish. Includes case, mouthpiece, and valve oil. All Yamaha wind instruments come with a limited 5-year warranty.