This is the JK's signature model, the Exclsive 3DK A1. | Rim Inner Diameter: 17.0mm | Rim Width: 4.0mm | Bore: 4.2mm | Cup Depth: Normal | Cup Shape: V-cup | Retail Price: 15,400 yen Used for about a year. There are small scratches on the outside of the rim and a slight distortion on the shank end, please check the photos.