Compression spring 1.material: spring steel, stainless steel, 60si2Mn etc. 2.ISO9001, 14001 3.wire: 0.2-30mm 4.zinc pated Compression spring1.material: spring steel, stainless steel, 60si2Mn etc. 2.ISO9001, 14001 3.wire: 0.2-30mm 4.zinc pated, trivalent plated, PVC5.Welcome customize drawings. Compression spring