... -selling Compression Spring Wire diameter0.02-12mmMaterialSteel: steel, carbon steel, stainless steel, music wire steel, plated steel, galvanized steel, other alloy steelCopper: copper, phosphor copper, beryllium ... Compression springs, Extension springs, Torsion springs, Battery spring, Power spring, Coil spring , Leaf spring, Mould spring, etc. and other unique feature ...