Donut Cock Rings 50 Piece Display. Cock rings are made from safe, phthalate free, non-toxic materials Thermoplastic Rubber TPR. Thermoplastic Rubber TPR is a class of polymers, the characteristics of which mimic many of those of Silicone hygienic, soft, pliable, durable, non-porous. Safe and pure phthalate free as well as recyclable. A water based lubricant is recommended. Stretchy and durable. Assorted colors: black, clear, blue. 50 piece point of purchase display. Cock rings when worn around the base of the penis and testicles, many users find that cock rings increase sexual pleasure. Prolong rings, erection enhancement, climax control rings, cock rings. Donut Cock Rings 50 Piece Display from Blush Novelties.