When the perfect balance of control and explosive power comes together in a string, we call it HAWK. This monofilament string's inner crystalline core, which influences control, and the outer molecular chains, which influence power, are perfectly balanced thanks to the innovative Crystal Core Technology, a unique manufacturing process. Highly durable and with high spin potential, these strings are the perfect weapon for the high-level Tour and tournament player. After all, with great power comes great responsibility. Head Hawk Power 17 Tennis String | Blue | Christy Sports