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 (73.6sq in) & are recommended for advanced to professional players. They weigh 140g (5oz) & are head heavy balanced for more power, stability & spin. The X Force rackets offer a 14 x 16 string pattern & incorporate the Nano-Crystalline technology, which combined with the Ion frame results in a larger sweet spot & greater control for hard hitters such as David Palmer. In addition, they are strung with the Ashaway Supernick XL Micro string.