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Air Spring Steel Rings Front Crimp Rings 37126750355 Suspension Kit For BMW E53 High Quality Air Suspension Spring Steel Ring For BMW 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 Suitable For: BMW