The ion element psx from black knight is customised for a professional squash player daryl selby and packed with technologies delivering a fast and powerful frame it has a head size of 475cm2 736in2 and features the power surge technology for reduced vibration added stiffness and power as well as the thin k technology that provides an aerodynamic frame more structural strength and durability are ensured by the 16k hyper tensile fibre htf whereas the nano crystalline technology allows