K&N Universal Clamp-On Air Filter Ru-5321 K&N universal air filters is washable and reusable. Constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment. Filter can be stretched for up to 1/16 of an inch (1.5mm) to fit in-between sizes. Features: Designed to increase horsepower and acceleration Hundreds of sizes and shapes for most applications High air flow with excellent filtration Clamp-on washable and reusable air filter Malleable flanges One-year limited warranty Cotton Gauze Washable Centered flange 4.5 in (114 mm) Flange Inside Diameter Round Tapered Rubber top 9.5 in (241 mm) Height 0.625 in (16 mm) Flange Length 7.5 in (191 mm) Base Outside Diameter Red Filter