Size: This protective case comes in two sizes, M and S. Size M is suitable for ring sizes 10/11/12/13, while size S is suitable for ring sizes 6/7/8/9. Features:Our company's Printed silicone protective case is a perfect combination of style and functionality. It features vivid and long - lasting prints that add a unique touch to your device while providing excellent protection against scratches and minor impacts.Compatible with Oura Ring Gen 4/3. Design:The Printed silicone protective case comes in a variety of trendy patterns, such as floral prints,Starry sky pattern, Leopard print and Zebra print. The silicone material used is of high - quality, ensuring a soft - to - the - touch feel and a snug fit for your electronic gadgets. Great Protection: The sleeve covers the smart ring fully, essential for protecting your smart pal during physical activities including working out, lifting weights, sporting events or anytime when you may push hard with fingers. Easy to Use: The case is slim and strechy, easy to slide on the smart ring, adds the least thickness to the ring but get the most protection. Service: For any quality issues, please contact us for replacement anytime.