The RP-5103 Universal Air Filter is constructed from an oiled cotton filter media. It comes with a K&N embossed carbon fiber top and 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-5103 is a clamp-on filter that has an inside flange diameter of 3 7/8 inches and a flange length of 15/16 inches. The base is 12 inches by 6 inches and the filter height is 7 inches. This unique universal air filter is lightweight. Its carbon fiber top and flange provides outstanding strength with minimal weight. The smooth, glass like appearance provides the ultimate in finish, fit, and function.