Professor Foam's 1.75" Nitrile ring is rigid but flexible enough to stretch on. This is our most popular size of ring. Most men wear them behind the testicles for a stronger longer lasting erection. Nitrile is the same material examination gloves are made from so they are hypoallergenic.100% Skin-safe Nitrile is also compatible with ALL lubricants. Manufactured by PF Brands Inc. "Professor Foam, Princess Foam, PF2" are registered trademarks of PF Brands Inc.Professor FoamTM does not distribute or sell products to any 3rd party sellers on Amazon. This product is sold exclusively on Professor FoamTM Amazon store. Other companies selling this product are counterfeits. Please make sure to purchase a genuine Professor FoamTM product for proper authenticity and warranty.
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