Tecnifibre sets another string trend with the introduction of an entirely new string category: Hybrid 3D. The Hybrid 3D category is comprised of strings that combine the benefits of both PU Multifilament strings and Polyester strings into one product. No longer do players need to use two different strings to get the performance they need. With the brand new Hybrid 3D string HDMX, they can have it all in one package. HDMX provides high levels of performance in three critical categories: Playability, Arm Integrity and Durability. The Playability of HDMX is revealed in a higher level of energy return, due to the utilization of Tecnifibre's premium Elastyl multifilament fibers. Arm Integrity is enhanced through the new PU HD process, combining Tecnifibre's proprietary polyurethane impregnation process and low-speed stretch to saturate and surround each fiber with the ultimate in shock absorbing material. The result is an explosive and reactive, yet firm and durable string that brings the perfect balance of power and control. Finally, the Durability comes from a unique blend of polyamide and polyester fibers and Tecnifibre's SPL coating, producing one of the most durable multifilament strings on the market.