1.Name: hot coil big compression spring 2.Style: alloy Steel 3.All the production ... 1) Products Scope: Compression Spring, Extension spring, Torsion Spring, Battery Spring, Power spring, Coil spring, leaf spring, suspension spring, etc. 2) Main material: Carbon spring steel, alloy spring steel, Refractory steel, ... , hardware and plastic moulds, sports equipment and toys. hot coil compression spring