HEAD Hawk Touch Tennis String 120m ReelLength 120 m 1. 20 mm 18 g, 1. 25 mm 17 g, 1. 30 mm 16 g When you put these strings on your racquet, you better already have things under full control. Thanks to the innovative Crystal Core Technology, a manufacturing process that allows to influence each string's individual balance between power and control, the HAWK TOUCH monofilament string features a bigger crystalline inner core responsible for providing ultimate control to your game. Designed