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Mercedes W221 Rear Air Suspension Rubber for Air Shock OEM 2213205513 Air Suspension Air Suspension is a type of automotive suspension that uses air springs instead of conventional steel springs. Computer-operated vents on the air springs, suspension sensors, and an onboard air compressor allow the system to maintain ride height and vary the suspension's ride characteristics. Product Description Spring Type: Air Spring Spring Material: Rubber Shock Absorber Type: Gas-Filled