The Black Knight Ion Element PSX Selby double pack contains two squash rackets full of technology customised for Daryl Selby. The rackets are head light with a head size of 475cm 2 (73.6in 2), & are strong & powerful yet controlled, stable & aerodynamically efficient thanks to Power Surge, Nano Crystalline & Thin-K technology. Vibrations have been reduced & the durability has been increased, with the rackets strung with Power Nick 19 strings for extra power & performance. Full-length protective covers are supplied with the rackets.