Battery spring with wire diameter from 0.08mm up to 3. ... carbon steel, piano steel, SUS, alloy steel, iron, plat 1.Battery spring with wire diameter from 0.08mm up to 3.6mm2 ... iron, plated steel etc3.widely used in chargerrecorder,flashlight,calculator,battery charger,toy and other electric areas4.Packing with plastic bags ... designs are welcome,so send us your specifications now. battery spring