... >OEM and ODM 3>EXW price & strictly quality control Steel drum spring manufacturerFeatures: 1) Wire Diameter: 0.08~ 10.0mm 2 ... ) Type: compression drum spring. 3) Main material: carbon spring steel, alloy spring steel ... steel, high temperature resisting alloy, corrosion-resistant alloy and bronze.4) Good resistance to both high and low temperatures 5) Surface ...