These Duraflex side skirt rocker panels are designed for 2014 - 2020 BMW 4 Series owners who want to enhance the look of their cars. Whether you're driving on city streets or hitting the track, these panels will make your BMW stand out. They are made of FRP material, which is lightweight yet strong. The M4 look style gives your car a sporty and aggressive appearance. Professional installation is needed to ensure a perfect fit.