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 GAMMAs 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 wrapColor: NaturalGauges: 16 g / 1.32 mm 17 g / 1.27 mm 18 g / 1.22 mm