Volkl Power Fiber II 17g Reel is a natural-gut-like performance multi-fiber string that's been upgraded. Thanks to a patented "high-pressure-resin-misting" coating process, this string doesn't notch as quickly and has longer tension maintenance. This process has up to 30% less of the bonding-resin needed to secure the multi-fibers together ending with 30% more actual fibers within the same gauge of string. Power-Fiber has a final outer coating of Nylon 6.6 for easier stringing, and improved durability. The thinner gauge will give you a little more feel in exchange for some durability. Construction: Multifilament polyamide Gauge: 1.25 mm / 17g Color: Natural Length: 660 ft / 200 m Need help selecting a string? Check out our Choosing The Right Tennis String Guide for more assistance.