K&N Universal Clamp-On Air Filter Ru-2690 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 1.75 in (44 mm) Flange Inside Diameter Round Tapered Rubber top 2 in (51 mm) Top Outside Diameter 2.5 in (64 mm) Height 0.625 in (16 mm) Flange Length 3 in (76 mm) Base Outside Diameter Red Filter