... per custom-design 3>EXW price. helical compression spring for chairDetailed description: 1) Spring Wire Diameter: 0.08~ ... 12.0mm2) Spring Type: Compression spring for chair. 3) Main material: High carbon steel, spring steel ... receiving your payment.11) Application: Widely used in automobiles, motorcycles, electrical appliances, telecommunication, craft, toys ,locks,stationery,furiture ...