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.