Size M has an outer ring of 2.9cm, an inner ring of 2.5cm, a height of 1cm, a net weight of 1.72g, a single package of 2.8g, and a packaging of 12×7.5×1cm. Size S has an outer ring of 2.5cm, an inner ring of 2.1cm, a height of 1cm, a net weight of 1.49 grams, a single package of 2.58 grams, and a packaging size of 12×7.5×1cm. Multifunctional: Our silicone ring covers are suitable for various sports activities, such as swimming, yoga and surfing, completely covering and protecting your smart ring, ensuring safety and worry-free. EASY TO USE: Thin and flexible, the silicone ring cover shell slides easily onto the smart ring, adding minimal thickness while providing maximum protection. EASY TO CARRY: Our silicone loop cover provides a comfortable fit while maintaining a good grip. The compact size and smart design make it easy to carry and use anytime and anywhere. WIDELY APPLICABLE: With our silicone ring covers, your rings will be convenient and protected. Sizes M and S are available for ring sizes 11, 12 and 13, and 6, 7, 8, 9 and 10 respectively. Very suitable for use. Carefully crafted: Our silicone ring covers are molded on real machines, demonstrating exquisite craftsmanship. Each hole is precisely cut to ensure a perfect fit without compromising design or comfort. Applicable models: For Oura Ring Gen 3 Material: silicone Packaging: bagged Includes: 1 piece silicone case for Oura Ring Gen 3