... core. The raw material is quality carbon spring steel. Detailed Product Description1,Name:Spring steelrope, Spring Wire ... with core.2,Raw Material:Quality carbon spring steel,60#,65#,70#,72A,82B3,Standard:ISO , ... 1670mpa,1860mpa,1960mpa6,High carbon spring steel wire (Galvanized,Ungalvanized,coatedPVC/PE/teflon/rubber ... ,Diameter:0.15-12mm(carbon spring steel wire ) 1.2-20mm(steel wire rope)8,Place of origin ...