The big "O" rings - sex toy by Sportsheets - review by aliceinthehole

Flexible and varied in their size and use, these Screaming "O" Rings are a must have for any strap-on harness. They allow for complete versatility and mobility, turning any o-ring compatible strap-on into the home base for a wide variety of dildos, from 1 inch circumference up to 2 inches.
The set comes with four black rubber rings; 1", 1.5", 1.75" and 2" in circumference.

The rings work thus: simply choose the correct size for the circumference of your dildo, listed conveniently in the toy profile when bought from Eden Fantasys. Snap the o-ring in place on your harness, and slide the dildo through the ring, positioning it so that any curve in the dildo is pointing towards the ceiling (for maximum G-spot pleasure as well as realism). The ring serves to stabilize your dildo, holding it close to your body and firmly in the harness, allowing for hands-free realistic thrusting.

These rings are great for pegging, bobbing, lesbian sex, and gender role play. When coupled with your strap-on harness and dildo, it is fun even to walk around in for a female, as it provides a sensation unknown to those of us born without a penis.

As far as the sturdy factor, these practically odorless rubber rings have so far shown to be as hardy as can be (and at a price that can't be beat).

For cock ring use however, I found that even the smallest ring, the 1 inch ring, was just barely too large to do much for my man's average-girth penis. The larger rings could never begin to squeeze tight enough to restrict blood flow and delay orgasm.

Cleanup is easy, with a small amount of mild soap and a thorough rinsing. The rings may be stored in the plastic container they are originally packaged in. Otherwise, a similar hard, non-fabric material is recommended for storage, as a fabric bag or similar material may help collect unwanted dust.