CNC-machined aluminum backing plate Internal rubber breather tubers to eliminate oil leakage Internal power cone design for smooth, laminar air flow Innovative conical design for improved knee clearance Contrast Cut™ finish starts with a polished air cleaner that has been black anodized, then recut to open the design Black Ops™ finish features gloss black on top of a contrasting textured black finish for outstanding durability and looks All mounting hardware and gaskets included Made in the U.S.A.