The wilson control duo hybrid tennis string set has a length of 128m 42ft which is enough to string one racket the string provides durability and feel typical to hybrids and guarantees controllable power it combines the wilson nxt power string that delivers a great balance of power and comfort with a gut like feel and the luxilon alu power string which ensures excellent durability as well as more power and feel the nxt power string has a gauge of 16 130mm whereas the luxilon alu power