The black knight ion x force black squash racket double pack comprises of two rackets packed with innovative technologies to provide outstanding performance the rackets have a head size of 475sq cm 736sq in and are recommended for advanced to professional players they weigh 140g 5oz and are head heavy balanced for more power stability and spin the x force rackets offer a 14 x 16 string pattern and incorporate the nano crystalline technology which combined with the ion frame results in