Decorative Chrome Plating, often referred to simply as chrome, is a technique of electroplating a thin layer of chromium onto a metal substrate. Bright chrome and other finishes are produced on automated rack plating lines with successive electroplating of copper, nickel and chromium. In addition to bright chrome on die cast zinc, brushed nickel and satin chrome finishes can be produced, which are popular in many home décor products, plus specialty plating of brass as well as steel substrates. Decorative chrome is designed to be aesthetically pleasing and durable. Thicknesses range from 0.002 to 0.020 mil (0.00005–0.0005 mm), however they are usually between 0.005 and 0.010 mil (0.00013 and 0.00025 mm). The chromium plating is usually applied over bright nickel plating. Typical base materials include steel, aluminum, copper alloys, and zinc alloys.