The Head Hawk tennis string has been developed in co-operation with Head’s top pro players to deliver extraordinary energy efficiency ensured by the Head Crystal Core technology which helps generate explosive power without compromising on optimised control & touch in every shot. It provides more feel & power than a conventional polyester string & has a monofilament core for enhanced durability. The string is supplied as a 12m (40ft) set, which is enough to re-string one racket.