Thank you for viewing. This is a Greg Black New York Series 5.75 size (regular weight). In terms of backbore size, it's about a 4G (inner diameter 25.95mm). Compared to the Standard Series, the rim is slightly more rounded, making lip slurs easier, which is why I bought it. I played it for almost a year, but the 7 series suited me better, so I'm selling it. There are small scratches from use, but there are no major scratches or dents. I will ship it with the included case, wrapped in cushioning material.