The KandN Air Filter Element interchanges exactly with the stock paper element. It is constructed with cotton gauze material sandwiched between fine wire screening. This beautifully crafted filter is pre-oiled and ready for installation. This KandN filter comes with a Million Mile Warranty, and is certified to be street legal. KandN has done an outstanding job of supplying fully detailed instructions, a service record decal, and a warranty/registration card.