The RP-5135 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-5135 is a clamp-on filter that has an inside flange diameter of 3-5/16 inches and a flange length of 2 inches. The base is 18-3/4 inches by 5 inches and the filter height is 4-13/16 inches. The filter top has a threaded hole to accommodate a 6 millimeter bolt for easy mounting.