All Bach Stradivarius bass trombones feature .562" large bore, one-piece yellow brass bell, chrome-plated nickel silver seamless inner slide, brass outer slide, nickel silver handgrip, tubular nickel silver body braces, genuine Vincent Bach mouthpiece, deluxe wood shell case.

MODEL 50BO - 9-1/2" one-piece yellow brass bell, traditional rotor mechanism, open wrap