Yamaha YBL-835 Bass TromboneYamaha combined the knowledge they learned in creating the Xeno tenor trombones with feedback from some of the world's great bass trombonists. The results speak for themselves; a state of the art bass trombone with all specifications redesigned by an elite team of Yamaha designers and R&D experts. The 830 model includes features such as the newly designed yellow brass bell with a thinner wall for enhanced response, nickel silver slide crook for more