DTA 70096 Full Set 2 Front Complete Struts with Springs and Mounts + 2 Rear Shocks 4-pc Set, 2007-2013 Chevrolet Silverado 1500, 2007-2013 GMC Sierra 1500 4WD, RWD Crew Cab, & RWD Extended Cab (Exc. Electric Ride Control) Fully loaded complete unit is safe and easy to install. Guranteed fit and function. The strut is nitrogen gas charged with 4 Lip Teflon banded Piston Seal, micro polished chrome plated piston rod and all weather SV3 fluid. Coil Spring is heated treated & powder coated to ensure longevity and protection from Corrosion. Spring seats insulated to springs to ensure quiet and comfortable ride quality. Neoprene boots and bump stops when applicable. Limited Lifetime Warranty