Product Descriptionú¦This coil spring is for brake sysytem of car. The material we use is as our customerí»s requirement, such as 55CrSi, 60Si2Mn, 72B, 82B and so on. Product Feature Best selective materialú¼best approved quality cheapest reasonable price Product Specificationú¦we can produce all kinds of sizes for this kind of spring after received customerí»s drawing or sample. Surface quenching, deburring of end, surface protecting process, colorful painting as request. Optional Information - HS Code : 7320 Springs and Leaves for Springs, of Iron or Steel White packing box