Vulcarbonized Rubber strap with 316L Stainless Steel TANG BUCKLE engineered to fit Rolex SS or Yellow Gold Daytona cases*. (NOT compatible with White Gold or Rose Gold versions. Also not compatible with Oysterflex bracelet models). This strap utilizes "Blocked Integration" engineering, incorporating solid inserts for a flawless, motionless flush mount to the Daytona case, and features the Rubber B signature "T" design.