Stretch-Liquid Silicone NUT.
A nut always comes in handy... It can be a cockring or a balls ring or a glans ring. Available in two colors: black or silver.
The "Stretch-Liquid" is super stretchy and easy to open, put on and take off whenever you want. It does not tighten as much as the "Stretch-Hard", but that is why the inner diameters are narrower to achieve the same effect.
In the case of the NUT, the inner diameter is 25 mm., the ring thickness is 21 mm. and the outer diameter is approximately 55 mm.
Remember to always use a water-based lubricant with silicone toys, as silicone lubricants weaken the toy in the long run.
