These are made of our best pure Liquid Platinum Silicone. This stuff is fleshy warm and heavy…it feels like it is part of you. Because these are silicone they are very stretchy but also heavy. Platinum Silicone is the heaviest material for ballstretchers—that makes these the best around. The extra heaviness feels amazing pulling your sack down.The design of CLONE looks a bit intimidating but we have tested and used this toy (it’s hard work here at OXBALLS but we do it). CLONE feels good…really good it’s perfect for big ballers or high & tight sacks. We love this toy!