Kanstul 1585 In Line Bass Trombone Double Rotor Bass Trombone. B flat / F /  G flat / D.  .562" - .593" bore. Custom Built from the Kanstul factory in 2009. Custom 10 1/2 inch medium weight Rose Brass Bell (Factory horns were 9 1/2 inch)Custom light weight slideIn Bell tuning3 lead pipes, Bach, Open Legit and George Roberts. Comes with a George Roberts custom bass trombone mouthpiece. With the GR lead pipe and the GR mouthpiece this horn will produce the mellow George Roberts sound.  Kanstul CR valves, very fast and responsive. Slide is in excellent shape, all tuning slides move free. Comes with a Protec Bass trombone case. Adult owned and played. I am the orginal owner and had the horn built to my specs from the Kanstul Factory in 2009.  Wonderful instrument, played in local community groups. Item shows little wear, a couple of scratches around the mounting section from the slide to bell. This is a big bass trombone, and will produce a huge solid centered sound. You can push this horn and it will increase in volume but not crack in the tone. Ships to the 50 United States, buyers in Hawaii and Alaska will pay higher shipping costs. No international shipping.