The Rock Solid Sila-Flex Glow-in-the-Dark Big O C-Ring is designed for enhanced comfort and functionality. This ring features a perfect cylinder shape with an inner diameter of 1.25 inches, a height of 2 inches, and a width of 0.375 inches. It utilizes the latest glow-in-the-dark technology, which requires exposure to bright light or sunlight before use to activate the glow effect. Made from premium, phthalate-free hybrid silicone, the Sila-Flex provides an ultra-smooth and soft finish. It is durable, unscented, and offers extra stretch while maintaining its original shape. To ensure longevity, it is recommended to clean the ring with anti-bacterial soap and water and to only use it with water-based lubricants. Color: Green. Manufacturer: Rock Solid.