essentially 4 pieces of plastic in the shape of a fender. What's not to like?! They come with fasteners (a couple of screws) but I haven't used them. I drilled holes in mine to attach to the car using the factory clip locations that attach to the fender liner and rocker panels. I made a side front and back and then cut it to the desired shape with a sharp pair of scissors. Since the machine is symmetrical I removed that side and used it as a template for the other side to cut to the same shape and drill the mounting holes. worked great.