Gamma Live Wire Professional features Live Wire Multifilament Technology. Professional features an advanced string construction that incorporates 50% more Iso-elastic Fibers NCP Tension Fibers for longer tension maintenance and new PEEK abrasion resistant fibers woven within the outer wraps for enhanced durability. This unique construction combined with GAMMA s exclusive Advanced Irradiation Process provides Gut-Like Performance and a crisp solid feel preferred by top professionals. Construction: Live Wire multifilament core with Live Wire Iso-elastic fibers with high-impact urethane resin and PEEK fiber-reinforced wrap Color: Natural Gauge: 16 g / 1.32 mm | 17 g / 1.27 mm | 18 g / 1.22 mm Length: 40 ft / 12m Features: -PEEK abrasion resitant fibers in outer wrap -Gut-like performance -Improved tension maintenance For more information on strings see our following blog posts: 10 Best Multifilament Tennis Strings Today 4 Main Types of Tennis Strings Need help selecting a string? Check out our Choosing The Right Tennis String guide for more assistance.