The Oxballs Nailed ballstretcher gets us back in a medieval world, where torture was used. But fortunately, silicone replaced iron! Indeed, many soft silicone nails get through that ballstretcher in your testicles once put on. It stretches very well and is very comfortable, it will take more than a crowbar to the take it out. Like all silicone Oxballs products, it is compatible with all lubricants. Nails will never give much fun than the Nailed Ballstretcher.