K&N ENGINEERING E-0771 Air Filter; Round; 4.938 in. OD; 3.125 in. ID; 6.813 in. H; Biodegradable Cleaning Product Adds Up To 15 Extra Horsepower Made From Cotton/Screen Wires; Keeps Dirt On Outside Additional Filtering Barrier; Long Lasting Performance Reusable/Washable; Double Air Flow