AIRBALLS is a ball stretcher version and the latest addition to our AIR product line. AIRBALLS is made from a soft, smooth plus+SILICONE™ blend that is stretchy and supple, yet firm enough to provide a solid stretch. AIRBALLS features several drainage holes for easier wear while also serving as a holder for electrical contacts. The Ergo-Dip design and soft material ensure a comfortable wearing experience. Our unique ball stretcher design is unlike any other on the market. If you are a fan of our best-selling AIR Ring, you will love our latest ball stretcher version, AIRBALLS. AIRBALLS is perfect for high and tight sacks or for stacking with your favorite carry. Material: Silicone, phthalate-free.