Shop Oura Ring Gen3: Heritage Black,Oura Ring Gen3 Heritage - Stealth - Size 9 - Smart Ring - Size First with Oura Ring Gen3 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness ,Shop Oura Ring Gen3: Heritage Black,Shop Oura Ring Gen3: Horizon Black,Oura Ring Gen 3 3rd Horizon Generation Ring Black US Size 8 | eBay,