Putco part # 400507 is a set of chrome mirror overlays that are designed to stick over the factory mirror. Putco mirror covers are made of ABS plastic with a chrome plated finish that matches the OEM chrome trim perfectly. We recommend these ABS plastic covers over the stainless ones because plastic can be molded into shapes that cant be duplicated with metal so they fit much better and more of the original mirror is covered. Each cover has 3M automotive grade tape pre-applied to for a quick easy install that does not require cutting or drilling.