Available for immediate purchase! JK (Yamaha Custom) 2DM Inner cup diameter: 17.5mm Throat size: D (4.2mm) Cup shape: M (U cup) Silver-plated finish (SP) Included: ・Mouthpiece brush ・Sticker ・Outer box This is a popular brand for orchestras and wind bands. This rim is ARB specification. It feels a little thinner than the current rim. There is a slight scratch on the shank, probably from a test run, but it is in very good condition. I bought it, but I haven't had much opportunity to use it, so I'm selling it.