Get a good grip on yourself with this silicone Tri-Ring set.  :)   Soft,  stretchy and comfortable to wear. The two rings that fit around the base of your cock and the balls are 1" in diameter and after stretching the rings over and around will give a nice grip on your cock and testicles.  The ring going around the base and balls is 1.25" in diameter and adds to the gripping affect on your entire package.

Note: The texture of the silicone these are made from has a tacky feeling to it, similar to the silicone that Fleshlight sleeves are made from.  This does not diminish the quality or the performance of these rings in any way.  Maybe it is meant to grip the skin better, who knows.  Anyway, if you wish, you can always use talcum powder or corn starch on them and give them a smooth powdery finish.