Tri-O Waterproof Vibrating Couple’s Cock Ring from Screaming-O is a dual ring made pliable rubber. This product is waterproof and features two connected rings and two battery-powered push button bullet vibrators.
Here is a tidbit from Jennifer’s review of the Tri-O Waterproof Vibrating Couple’s Cock Ring:
“I had an assumption that the texture was more for decoration than anything, but from my side of the cock ring fence, that’s my favorite part about this toy. The vibrations didn’t do a lot for me since they’re not very strong, but my partner did really enjoy them because they were so subtle, particularly with the vibe resting between the base of his cock and his balls.”