---Rock Solid Glow In The Dark Big O Ring - Black/green - Classic Penis Rings THE LATEST GLOW IN THE DARK TECHNOLOGY. IMMERSE UNDER BRIGHT LIGHT OR IN SUNLIGHT BEFORE USE TO IGNITE THE GLOW EFFECT. --- --- Only use with water-based lubricant. Clean with anti-bacterial soap and water. Sila-Flex is a premium, phthalate-free hybrid silicone with an ultra-smooth and soft finish. durable, unscented, and extra stretch, while retaining the original shape. --- --- Rock Solid The Big O Glow-in-the-Dark Delay Ejaculation Non-Vibrating Penis Ring Features: --- --- ---Width/Diameter: 2 inches ---Unstretched Inner Diameter: 1.25 inches ---Depth: 0.