2014-2016 Honda Civic D2 PRO Series Springs (D-SP-HN-52) Progressive Spring Rates: Allows for a comfortable ride under normal travel and during compression, the rate increase to help with body roll High Tensile Wires: Cold wound for strength and shot peened for increased stress relieft 1 Year Manufacturer Warranty. We advise our customers who utilize the principle of adjusting ride height to balance the weight of the tire when installing to increase LSD life-cycle. Made of aluminum material to reduce the weight of vehicle.