Experience maximum dynamic stiffness and powerful repulsion with BETA Polymer Technology. The ZyWeaVeTM core prevents tension loss and enhances strength and durability, making Ashaway ZyMax 66 Fire Power the ultimate choice for both professional and amateur players. Achieve precision in your shots with this string's exceptional repulsion and power, while minimizing tension loss and maximizing strength and durability. It can handle stringing tension of up to 35 lbs (16 kgs).