Black Knight Ion Cannon PS Castagnet Squash RacketHead Size 500cm2 Weight 135g Balance Head Heavy String Supernick ZX Construction Nano Carbon Nano Crystaline Description; Meet the Black Knight Ion Cannon PS Castagnet squash racket, used by Mathieu Castagnet, the 2016 Canary Wharf Classic winner and French National Champion. This racket is developed and made to his precise specs with a head heavy balance and a large 77. 5in2 (500cm2) head with an open throat design. It also features his preferred