The Genesis Typhoon 16L Tennis String is a co-poly material with aluminum fibers that offer players the best in feel and power. Extra coating of Teflon increases the durability of the string while adding an extra power. Genesis Typhoon is made from a proprietary composite formula of high-tech polyester resin combined with new performance enhancing chemical additives. Utilizing the most innovative and cutting edge technology, Genesis has created a string that excels in every category. It is great choice for the players seeking the maximum spin potential for their racquets.