Power up your play with the HEAD Hawk 17 1.25mm 12m tennis racket string in White. Featuring Crystal Core technology for explosive performance, HEAD Hawk tennis strings are designed for power and control. Crystal Core technology is a multistage thermal treatment that creates distinct differences between the inner and outer parts of the string, resulting in increased elasticity and greatly improved energy efficiency for easy access to unrivalled power. Gauge 17/1.25mm, Length 40ft/12m. Composition: Copolyester monofilament.