Stretch-Liquid Silicone Ring
The "Stretch-Liquid" is super-elastic and easy to open, put on, and remove whenever you want. It doesn't squeeze as much as the "Stretch-Hard", but that's why the inner diameters are narrower to achieve the same effect. In this case, the inner diameter is 40 mm., the thickness of the ring is 40/40 mm., and the outer diameter is 83 mm. What an impact, this is from a monster truck!
Remember to always use a water-based lubricant with silicone toys, as silicone lubricants weaken the toy over time.