| String breakers weary of making the leap to polyester have an option! According to Wilson, Red Alert 's special coating gives it twice the durability of comparable synthetic guts. This makes it ideal for habitual string breakers. Our testers reported a crisp response with phenomenal directional control. To add comfort, Wilson wraps the core with strategically textured, spin-producing triangular filaments. Taken together, the result is an arm-friendly durability string with good bite and impressive control.