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 .  HDX Tour features the SPL technology (Silicium Pyrogene Lubritec), an abrasion resistant coating to increase the durability.  Tecnifibre's PU Inside technology to bind the multifilament fibers together provides up to 100% elasticity for the ultimate comfortable feel for touch shots. A perfect combination for the player seeking a string with power and comfort. Also check out the line of Tour-inspired Tecnifibre racquets.Construction: Multifilament, 34% Elastyl™, 33% Polyester, 33% Thermostabyl Color: Natural Length: 40'