Most people don't look at their door sills when they open the door. It's not the first place your eyes drift to (especially on highly personalized interiors). But your door sills are prime real estate for some decoration. It's a very long space with and when something is there the eyes are drawn to it. BMW chooses to dress up this area with additional ///M or Individual branding. These door sill strips are Genuine BMW factory accessories.
These are genuine factory pieces engineered by BMW to snap cleanly onto your rocker pinch welds, protecting the body sheet metal and restoring the clean look your BMW had when it left the dealership
