Maxtrac Suspension Twin-tube Shocks were designed as an affordable upgrade replacement for the factory shock when lifting or lowering your Truck or SUV. Manufactured using a gas pressurized twin-tube design. This Shock has a larger diameter piston to provide better dampening and rebound when compared to an OEM shock. We have engineered our shocks to give the best ride during normal and spirited driving and our shocks are designed to last the life of the vehicle. Features and Benefits: " Specifically formulated low friction shock oil " Hardened chromed piston rod provides superior corrosion resistance and enhances sealing properties " Nitrogen gas charged to improve ride, handling, and reduce shock oil aeration. " Shocks Sold Individually Specs STEM / LOOP 18.2 Extended 11.3 collapsed