T-Fight 300 Isoflex Grip 4 tennis racket is the most playable 18-post racket available. Developed to provide power and control for the serious competitor with a 630sq cm headsize and 18-post string pattern. But the new T-Fight Isoflex range is designed to unleash players potential with two TecniLab innovations: RS Section and Isoflex, which provide a specific sensation of dynamic control.