GRINDER ballstretcher is made of heavy thick rubbery silicone…the heaviest and softest ballstretcher we make…the extra weight helps your nuts hang low…but this fucker is so soft and squishy your balls aren’t gonna feel too much squeeze… We made this bad-boy thicker in the middle to push your balls down low, the “thicker” middle keeps your nuts from popping back up and out…and with 2 sizes GRINDER keeps even high-tight shy-balls low in their bag…the added weight of the thick silicone puts extra pressure at the top of your nuts just where you want it and feel it… The GRINDER-2 large size is for medium balls in a bigger size sack and huge nuts in a low-hanging bag… Silicone is the only material that will not irritate your sack, warms up and stays warm, and feels kinda like skin…we invented the silicone ballstretcher and keep making em better and better…Advice from OXBALLS, (we know a lot about ball-stretching): warm up your lube, warm up the ballstretcher by putting under hot water for a bit, because a cold chill on your nuts makes em wanna suck up inside you…if you have a high and tight sack, put your ballstretcher on in a warm shower or tub after your sack relaxes…and use a little lube on the inside the toy, that way as your sack relaxes the stretcher can slide and adjust…