Tecnifibre-HDX Tour Tennis String Natural-() Tecnifibre HDX Tour provides players with maximum feel and controlled power. Utilizing their Elastyl fibers, which give 12% more power than standard materials, Polyester fibers for a firm feel, and Thermostabyl for spin and string snap back make this multifilament ... Spl Technology | Maximum Feel And Controlled Power | 100% Elastic Size - (16G) | Color - (See Description) Authorized Tecnifibre Dealer. All racquets are strung and ready for the courts! SEE SELLER DETAILS FOR RETURN POLICY.