This is a medium-weight trombone/euphonium mouthpiece "NEWYORK5" for large bore instruments, made by the American mouthpiece maker "GregBlack". Inner Diameter: 25.95mm Throat Diameter: 7.13mm Cup Depth: Medium It feels like a slightly shallower model than a Bach 4G. The medium weight should produce a full sound. There are some scratches on the throat from use, but otherwise, it's in relatively good condition. Feel free to ask any questions in the comments.