59 Series Economy (Previously Carrera Shocks 21 Series) Twin Tube DesignThe outer tube can get dented without binding the shock. 2" O. D. Steel Body 1/2" Bearings Gas Cell to Reduce Fade Not For Use With Coil-OversNotes: Be certain to check compressed and extended lengths carefully for proper fit. QA1's lengths do not necessarily correspond to competitor's lengths. General Tech TipsWhen running a split valve shock, it is important to understand that the valving will not reverse when the shock is mounted upside down. For example, a 5973-5 will always be a 3 valve on compression and a 5 valve on rebound regardless of the orientation of the shock. The function of your shock is to take undesirable motion (or energy) from your chassis and turn this energy into heat. Shock temperatures vary greatly depending on the damping rate, track conditions and ambient air temperatures to which the shock is exposed. Do not assume that your shock is not working just because it is hot. Help your shocks maintain top performance by wiping down the piston rod each week with a clean towel to keep dirt and grit from penetrating the rod seal area.Pit Stop USA offers QA1 59 Series Steel Large Body Economy Shock - 9" Stroke - 6 Compression, 6 Rebound Valving 5996 at low everyday prices. Be sure to check out all of our products from QA1 Precision Products including QA1 59 Series Steel Economy Shocks.