Strictly man to man..
Your M2M nitrile cock rings are completely skin-safe, so you don’t have to worry about anything but getting off! Pull on your mega nitrile ring and expect it to snap tightly around your hard cock and balls.
Ultimate rigidity, total safety and 3 sizes to choose from! Like silicone, Nitrile is a soft, non-toxic synthetic rubber that's pthalate-free and totally hypo-allergenic.
It also has the added benefit of being silicone and oil compatible so you can use it with any lubricant on the market. Give it as good as you get it!