HEAD PERFORMANCE: Born out of revolutionizing how we ski and play tennis, HEAD has constantly pushed athletic equipment into the modern era. With decades of experience in all racquet sports; HEAD offers nothing but top tier tennis equipment. TOURNAMENT LEVEL: The Hawk is a premium monofilament string that can help generate unparalleled spin thanks to its inner crystalline core. COMPOSITION: The 18 g tennis string is made from a co-poly core that's well balanced for a variety of play types. HIGH LEVEL CONTROL: A larger crystalline inner core aids in providing greater control every time the ball makes contact with the strings. AN IDEAL PAIRING: An excellent match for your favorite HEAD Tour racket for top level performance.