【Innovation and Upgrade】Seltureone silicone ring cover specifically designed for Oura Ring 4 Ceramic/Oura Ring Gen 4/ Oura Ring Gen 3/ Ultrahuman Ring. Reduced the unnecessary thickness, curved side design closely fits the edge of the ring, providing a comfortable wearing experience. (Medium for ring size 6-9, Large for ring size 10-13) 【Quick-Align】The small concave circular design is unobtrusive while facilitating alignment with internal markings. See & align the sensor instantly with external grooves—no need to look inside the ring. Saves time, every time. 【Anti-Slip and Comfortable】18 Hexagonal Pressure Relief Patterns on the inner wall Increase friction and enhances water drainage . Ensures that your smart ring stays dry and comfortable to wear throughout the day. 【Stylish and lightweight】Seltureone Ring Protector made from high-quality silicone, providing protection against daily bumps and scratches while maintaining a clean and beautiful appearance. It is your perfect companion for sports, work, or adventure. 【Seltureone Service】The Package includes 15 Multi-colored ring covers. Any questions please do not hesitate to contact us. Our customer Service Team will reply within 24 hours. [Note: silicone covers only, smart ring not included] Seltureone 2025 new upgrade ring cover designed for Oura Ring Gen 4/4 Ceramic/Gen 3. Medium for ring size 6-9, Large for ring size 10-13.