KN replacement filters are designed for all motorcycles and ATVs to O.E.M. (manufacturer) size specifications and fit into your original O.E.M. air box without modification or jet changes. Due to design and unique high flow characteristics, KN filters allow engines to breathe free and produce optimum horsepower. Under most conditions KN air filters never need to be replaced - with proper cleaning and care, KN air filters will last the life of your engine. Designed to increase horsepower and acceleration while providing excellent filtration. KN air filters use a four-layer cotton gauze filter membrane with a large surface area to improve air flow and offer longer service intervals. KN air filters feature an epoxy-coated aluminum wire mesh incorporated into the back-fire screen to protect the filter element. KN air filters are washable and reusable. Lifetime air filter with KN Million Mile Limited Warranty. Simple drop-in performance. The worlds best air filter. Filter Specifications: Product style: Unique air filters. Filter material: Cotton gauze. Flanges: None. Height: 1.125 inches (29 mm). Filter re-oiling amount: 0.68 ounce (20 ml). Outside length: 10.125 inches (257 mm). Outside width: 5.063 inches (129 mm). Weight: 0.94 pounds (0.43 kg).