Top material: The use of the best plastic, nuts, magnet,better performance What You Can Get:2 Top buckle,2 magnet,Some nut screws Safer: it can fix the truck bed, so that it does not shake when driving, to ensure driving safety Installation: According to the instructions, you can install it quickly,the top buckle is fixed on the truck with a nut About Us: If for whatever reason, you decide you are not satisfied, you can request a replacement