Ultimate Brass G3 Rim Inner Diameter: 28.98mm Throat Diameter: 0.316in / 8.02mm Gold Plated Finish This is a bass trombone mouthpiece. I used it for about a year, but I am selling it due to a change in size. There are signs of use on the rim and shank, but there are no accidents and there are no problems with playing. The original box is not included. Designed for players looking for acoustic characteristics similar to the Pollard model, but with a smaller rim diameter. Retail Price: ¥44,000