The Ashaway Monogut ZX Pro 17 string offers players gut-like response and power in a package that is durable and tension stable. This string utilizes an advanced material known as Zyex which has an inherently low dynamic stiffness. This results in better energy return to the ball and a more responsive feel than polyester or nylon based strings. The absence of polyester additives decreases stiffness and improves string elongation, resulting in natural gut like playability that has better tension maintenance than other polyester or nylon offerings. The Zyex monofilament construction offers better durability and resistance to conditions like humidity and moisture compared to natural gut. The 17 gauge diameter trades a slight reduction in durability for maximum feel and responsiveness. Frequent stringers will enjoy added value per string job by purchasing the 360 foot reel option. All court players in need of a responsive string with excellent tension maintenance, power and comfort will enjoy Ashaway Monogut ZX Pro 17. Please string at lower tensions and never above 60 pounds tension or the string will be prone to breakage. Perfect for poly players with more cushion. The reel has been used to string two mains so approximately 50 feet are missing. There's easily 275+ feet left. Construction: Zyex monofilament Color: Black Gauge: 1.22mm (17 gauge) Length: 360’ set