I purchased this about three years ago because I wanted a smaller rim diameter while I wasn't feeling well. Now that I'm feeling better and using it less frequently, I'm selling it while it's still in good condition. Although I wrote "smaller," this is by no means small; I think it falls into the "moderate" category for both rim diameter and throat diameter. Rim diameter: 32.5mm Throat diameter: 8.0mm Flat, wide rim Not-too-deep cup The wide rim provides stable contact with the face. The throat is neither too thick nor too thin, making it easy for me to control. In terms of specifications, it's a mouthpiece that can be used for B♭, C, E♭, and F tubas. There are signs of use on the shank and some polishing marks on the body, but the inside of the shank is still bright, and the condition is good. Highly recommended for those who want to try it as a main mouthpiece or as a standard mouthpiece with moderate specifications... but don't want to buy a new one. Please consider it.