they're splash guards, what info do you want. they keep the rear panel from getting road crap on it, just like any other car. oh but there is one thing you can do to ensure they stay black (if thats the color you want). get some hurculiner roll on bed liner and put a coat on, those splash guards will stay black forever, and they'll be tough as nails. you could probably run over a few curbs and not crack em.