For Mercedes W221 S320 S350 S500 S550 2213209313 2213204913 2pcs Front Air Suspension Front Shock Strut Air Spring,Shock Absorber for ,Made of stainless steel material, firm and durable. Rear Shock Springs,Simple installation, no complicated tools required, save time and effort,Advanced manufacturing, provides high reliability. The suspension shocks struts provides a smoother ride and better overall damping management. Durable and Long Lasting Construction,Built with Alloy Steel, These Shock Absorbers are Designed to Withstand the Rigors of Daily Driving and Harsh Environments. The Rear Shock Damper has precise manufacturing and cutting processes, which ensure a high degree of fit, providing a seamless look and enhancing attraction.