The Wilson NXT Duo II hybrid tennis string is supplied as a set that is enough to string one racket. The string is designed with those players in mind who look for excellent control & comfort. It combines the Wilson NXT string incorporating a multifilament core for power & feel with the Luxilon Adrenaline string that is equipped with a monofilament core ensuring extra spin & durability. The NXT has a gauge of 16 (1.30mm) & features proprietary Xycro Micro Fibres impregnated with PU for amazing feel & comfort, while the Adrenaline is 16L (1.25mm) in diameter & offers controllable power & precision.