Probably fine carbon fiber. For those saying it feels cheap, etc, carbon fiber is extremely light, and thin carbon fiber flexes like any other thin material. For those complaining about state compliance, you can see pretty clearly the design choice in the pictures and should have known what it would cover. My problem is the design. The lip is so deep that it will not fit any flush mounts for plates. The holes are larger than necessary. I'm planning to get some washers to better secure it, that is if I don't end up replacing the plate frame altogether. In the meantime, I had to use spacers in the back as, while my car has slight bumps for the plate mount holes, this plate holder is still way too deep. Good thin and light carbon fiber, but applied very very poorly.