The RP-5113 Universal Air Filter is constructed from an oiled cotton filter media. It comes with a carbon fiber top for strength and durability. The carbon fiber element adds to the light-weight design and gives this filter a smooth glass like finish. The RP-5113 is a clamp-on filter that has an inside flange diameter of 5 inches and a flange length of 1 inch. The base is 6-1/2 inches and the filter height is 5-5/8 inches.