The RP-5101 Universal Air Filter is constructed from an oiled cotton filter media. It comes with a K& N embossed 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-5101 is a clamp-on filter that has an inside flange diameter of 4-1/2 inches and a flange length of 5/8 inches. The base is 5-7/8 inches and the filter height is 6 inches.