TRU PRO Ghost Wire (formerly Tier One Sports): ONE OF THE SOFTEST CO-POLYESTER STRINGS ON THE MARKET! Ghost Wire is designed for players who seek the benefits of a co-polyester string but at the same time look for an elevated soft, arm-friendly playing response. Its new-generation polyester compound ensures players of all levels ultimate durability, high tension stability and precise directional and depth control. Its round, slick surface makes it a superb choice for hybrid string setups! KEY FEATURES: Super soft & arm-friendly, maximum durability with superb tension stability. RECOMMENDED PLAYING LEVEL: All Playing levels (beginner - pro). GAUGES: 16g (1.27mm). 17g (1.22mm), 18g (1.17mm). LENGTHS: Sets: 12.2mm/40ft, Reels: 200m/656ft, COLORS: White. ONE OF THE SOFTEST CO-POLYESTER STRINGS ON THE MARKET (based on lab tests by the United States Racquet Stringers Association)! Ghost Wire is designed for players who seek the benefits of a co-polyester string but at the same time look for an elevated soft, arm-friendly playing response. Its new-generation polyester compound ensures players of all levels ultimate durability, high tension stability and precise directional and depth control. Its round, slick surface makes it a superb choice for hybrid string setups!