K&N Cone Filter 3.375in ID 6in Base 4.5in Top 9in Height Carbon FiberThe RP 5118 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 5118 is a clamp on filter that has an inside flange diameter of 3 3 8 inches and a flange length of 3 4 inch. The base diameter is 6 inches, the top diameter is 4 1 2 inches and the