... :ShuangXinStyle: Stamping PartsLoad Type: CompressionMaterial: Steel,Brass,Matel,EtcUsage: Automobile;Auto;CarCertificate: ISO9001, TS/16949Continuous Coil Spring; 1.Material:steel,stainless steel.brass,aluminum,brass ... .cooper. carbon steel.2.Surface:zinc plating ,powdered,pas3.All our ...