Oura smart ring size 12 silver works perfectly. I’ve included some pics to show how it recorded my today’s activities. Also a video to show where the ring show signs of tarnish and where which is at the bottom of the ring as you have to wear it for the sensors to be at the bottom to work properly and then you can see how the rest of the ring has slight looks of wear, but is in good condition. want to upgrade to the GEN three and the stealth black therefore selling this one and will include the charging brick that has two USB-C ports ring comes with box charging cable, docking station, charging brick, the ring, and the instruction manuals.