... We manufacture a wide range of round wire torsion springs to customers individual requirements and keep ... with a quotation Wire size0.025mm (.005") upwards.MaterialsSpring steel, stainless steel, silicon-chrome, high carbon, beryllium-copper, inconnel, galvanised wire ... passivates, black zinc nickel, electroless nickel, black oxidise, copper plating & flashing, tin, chrome acid passivate, colour dyeing ...