Ultimate Brass Bass Trombone Mouthpiece G3 Silver Plated SP ◆ Rim Inner Diameter: 29.01mm ◆ Throat Diameter: 8.02mm ◆ Cup Depth: Deep ★ Beautiful condition, tried only a few times after purchasing new. The appearance is almost like new. The largest size in the standard lineup. While having a similar character to the signature Pollard model (DPP), this model has a smaller inner rim diameter. Ideal for players for whom the DPP (29.49mm) is too large. 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. Unlike other brands, they do not use numbering according to size, but rather name their products based on their respective purposes and images.