Grinder Ball Stretcher is made of heavy thick rubbery silicone. The heaviest and softest ball stretcher Oxballs makes. The extra weight helps your nuts hang low, but this ring is so soft and squishy your balls arent going feel too much squeeze. 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 to choose from, 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. Grinder 1 is for roid-balls, high and tight sacks, and medium balls stuffed in small bags.Silicone is the only material that will not irritate your sack, warms up and stays warm, and feels kinda like skin. They invented the silicone ball stretcher and keep making them better and better. Advice from Oxballs warm up your lube, warm up the ball stretcher by putting under hot water for a bit, because a cold chill on your nuts makes em want to suck up inside you. If you have a high and tight sack, put your ball stretcher 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. Features: Pure Platinum Cure Silicone. Lube safe water-base, oil base, water/silicone hybrid, silicone lubes. Cleaning always clean any stretchy toys after use, they will last longer. Use detergent and hot water, or put in dishwasher. Size best for normal to small balls. Total height 1.5 inches. inside diameter 1.125 inches, outside diameter 2.25 inches.