The RP-5285 Universal Air Filter is constructed from an oiled cotton filter media. It comes with a K&N embossed carbon fiber top and carbon fiber base 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-5285 is a clamp-on filter that has an inside flange diameter of 3-11/16 inches. The base is 8-3/4 inches by 5-1/2 inches and the filter height is 7 inches.