The shell and endbell material is aluminum alloy. The insulator, gasket and grommet are produced from synthetic rubber. The contacts are copper alloy with silver plating. Shell and endbell plating options are Olive Drab over Zinc, Black Zinc, Electro-deposited Black (RoHS) (meets 500hrs salt spray test), Black trivalent chromate over zinc plating, Electroless Nickel, Nickel, and Electro-deposited Olive Drab (RoHS) (meets 500hrs salt spray test).