GRINDER is a pure silicone ballstretcher with tire tread detailing. It's made from high quality Pure Platinum Silicone so it's blubbery and thick, perfect for the right amount of weight on your sack. This super detailed stretcher is squishy and flesh-like but has industrial tread detailing. The soft material and hefty shape create a stretching sensation for a more intense orgasm. GRINDER is available in two sizes to fit balls of all shapes and sizes.