Tecnifibre HDMX tennis string is designed for the larger group of tennis players who find themselves between multifilament and polyester strings. With Hybrid 3D technology, HDMX integrates a blend of polyurethane, polyester and polyamide fibres. The concept is to combine the comfort and forgiveness of a multifilament with the control and durability of a polyester. The string features Tecnifibre special SPL anti-abrasion treatment to improve durability. HDMX stands for a great "first step" when you leave the world of multifilament strings to achieve better durability and precision while maintaining comfort.