... 1.Material:60Si2Mn, SUP9 ,50CrVA 2.Type:guide arm,parabolic,variable section,suspension 3.ISO 9001:2008 QS-9000 ... :MERCEDES, MAN, FRUEHAUF, Volvo, SCANIA, BPW, SAF, YORK, ROR, DAF, IVECO, MIT, STEYR, KIC, WEBB, ISZ, R. ... are Original Equipment Manufacturers for the truck and trailer industries in their respective countries and are chosen ... shortest lead time in the industry. Trailer Suspension Springs