This double pack of black knight ion quartz psx squash rackets is full of technology such as thin k that makes the frame more dynamic and powerful and enhances performance the rackets are great for attack minded players as they are open throated head light and very manoeuvrable with a head size of 500cm2 775in2 and therefore a larger sweet spot power and stability comes from the nano crystalline technology and the powernick 19 strings the rackets are supplied with full length covers