Head IntelliTour 16g Tennis String This perfectly-blended string is engineered for the versatile TOUR or high-level tournament player who needs the power support of a premium multifilament string in combination with accurate feedback and exquisite feel. The string's nylon multifilament core and the outer shell made of polypropylene ribbons provide a unique touch and an outstanding feel. Soft feel and power is now a perfect match, thanks to IntelliTour. Length: Main 22 feet (6.5 m ) - Cross 18 feet (5.5 m)