Ultimate Brass Denson Paul Pollard (DPP) Silver Plated SP Large Bore Bass Trombone ◆ Rim Inner Diameter: 29.49mm ◆ Throat Diameter: 8.07mm ◆ Cup Depth: Deep ★ Beautiful condition, tried only a few times after being purchased new. The appearance is almost like new. Signature model of Denson Paul Pollard, bass trombone player of the Metropolitan Opera Orchestra. One of the largest bore sizes among bass trombones, it provides an unparalleled wide and dynamic sound. It's like the pinnacle of modern American symphonic sound. Ultimate Brass is a manufacturer that produces products in the United States. Founded in 2013 by SUN He, bass trombone player of the Oakland Symphony Orchestra.