Inner diameter: 16.80 Depth: deep Rim thickness: medium wide While the inner diameter is the same as a 10, the throat and backbore are wider. I bought this new and used it as my main mouthpiece for several years. I'm selling it because I've decided to use a different one. There are many scratches and minor imperfections from several years of use, but there are no scratches or dents that would affect playing. Instant purchase is OK.