The luxilon 4g is the number 1 string on pro tour used by such players as serena williams or paul henri mathieu it has been treated at a molecular level to provide more feel and longer playability without compromising on power spin and comfort this gold co polyester string is best suited to rackets with an open string pattern and designed to ensure maximum tension maintenance for long lasting high level play it incorporates a monofilament core and has a gauge of 16l 125mm the string is s