The Mega Ring Classic donut shape with an additional knob that applies pressure behind the scrotum for an ultimate climax super comfortable. For maximum pleasure and comfort, use water-based lubricants only. 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 Mega Sila-Flex Stretchable Glow-in-the-Dark Non-Vibrating Penis Ring Green Features: • The latest glow-in-the-dark technology • Immerse under bright light or in sunlight before use to ignite the glow effect only. • Provides incredible stretch allowing you to do as you desire. • This comfortable material is unscented and phthalate-free. • Easy to clean and incredibly durable.