This Bach Stradivarius Trombone features a .547" bore with an 8-1/2" one-piece yellow brass bell, chrome-plated nickel silver seamless inner slide, lightweight nickel silver outer slide, nickel silver handgrip and tubular nickel silver body braces. Designed with Bach's traditional rotor mechanism and three interchangeable leadpipes, this trombone offers musicians a multitude of options in one model. The instrument comes outfitted with a genuine Vincent Bach Mouthpiece and a classic style case. leadpipes included: Standard, Open, Long Open