CLASSIC DONUT SHAPE WITH ADDITIONAL KNOB THAT APPLIES PRESSURE BEHIND THE SCROTUM FOR AN ULTIMATE CLIMAX * SUPER COMFORTABLE * AVAILABLE IN BLACK OR TRANSLUCENT DIMENSIONS: INNER DIAMETER: 0.875in. HEIGHT: 2in. LENGTH: 2in. WIDTH: 0.5in. 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.