Mfr. springs Spiral springs, Compression springs, Die springs, Disk springs, Extension springs, Torsion springs, Helical springs, Leaf springs, Steel, Aluminum, Zinc, Cadmium, Iron, Nickel, Bismuth, Antimony, Non ferrous alloy, Ferrous alloy, Lead, Tin, Indium, Palladium, Slag or ash, Natural graphite, Base Metals, Hardware, Couplings, Connectors