Usually, fangs should be kept far, far away from your penis, penetrator, and partner. Of course, there are exceptions, and Creature Cocks' Fangs Silicone Cock Ring is one of them!

Slide on this (softly) spiky Ring to experiment with pressure, positioning, and stimulation; wear it over your fingers, or try it out (carefully) on a scrotum. If a penis is involved, Fangs can help support and maintain its owner's erection and even upgrade the intensity of their orgasm.

The pure silicone Fangs Cock Ring is hypoallergenic, easy to clean (use soapy water or toy care fluid/foam), and safe with any water-based lube you love. 

*Fangs stretches from about 1.4"/14cm