Stretch-Hard Silicone Crown.
The "Stretch-Hard" is elastic enough to get on and off but is a firm material which will maintain its diameter, gripping tight - designed to keep you hard as steel.
In the case of the Crown, the inner diameter of the ring is 40 mm. the thickness is 17 mm. and the exterior is a maximum width of 76 mm.
Remember to always use a water-based lubricant with silicone toys, as silicone lubricants weaken the toy over time.
