Based on the best selling Unit-X, this Stretch version adds more squeeze to your sack. It is sleek and super stretchy just like the Unit-X, but with an extra inch of rubbery ball stretching. There is an inner ring near the bottom that keeps your balls, even high and tight ones, pushed down. Made from Oxballs exclusive Thermoplastic Rubber TPR blend. It is non-toxic, phthalate free, and no scent.