Stainless steel parrot cages are the most popular type of parrot bird cages. Stainless steel bird cages are made of a low carbon steel which contains chromium. Chromium is the element that gives the steel the unique stain and corrosion resistant properties. The chromium material in the steel allows for the formation of a rough, adherent, invisible, corrosion resistant oxide film on the steel surface of the stainless steel bird cage