The Solinco Outlast Tennis String is a newly developed, high-performance and well-rounded co-polyester string designed to provide maximum durability and all-court playability. Utilizes an innovative high-powered co-polyester monofilament fiber designed to provide exceptional durability and unparalleled playability. Features: All-Court Playability - Delivers consistency and controlDurable & Reliable - Designed for those seeking a durable, control-focused string that maintains its responsive touchMaintenance King - One of the biggest beneficiaries of TruTension technology, it boasts the longest levels of tension maintenance found in a co-poly string Specifications:Composition: Co-polyester MonofilamentGauge: 17g (1.20mm)Length: 40’Color: Red Solinco Outlast Tennis String is engineered for all-court versatility, offering consistent performance across playing styles.