Vibrant Performance CLASSIC Filters feature an inverted cap design that increases the filter surface area for improved air flow and excellent filtration of airborne particles. This allows for significantly more airflow compared to stock filters while also providing excellent filtration on airborne particles. Each filter has been pre-oiled and is washable as well as completely reusable. Just clean the filter element every 10,000 to 15,000 miles depending on driving conditions. These filters are made right here in the USA.