The Mega Ring • Classic donut shape with additional knob that applies pressure behind the scrotum for an ultimate climax * super comfortable. For maximum pleasure and comfort, use with water-based lubricants only. • 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.