This is an optional Element RC Factory Team 10x90mm Enduro Shock Set, intended for use with the Enduro 1/10 Rock Crawler kit. Factory Team's 10x90mm coil-over shock set comes standard with CNC-machined aluminum shock bodies, ultra-smooth Delrin pistons, polished steel shock shafts, threaded aluminum spring collars, chromed steel pivot balls, mounting hardware and Element RC's 1.49 lb/in gray springs.