The Edelbrock K&N Replacement Reusable Air Filter Element is designed to work with Edelbrock triangular air cleaners. These reusable air filter elements are direct replacements. They are made by K&N to fit Edelbrock air cleaners to ensure top quality. The filter is made of cotton gauze material. It can be pre-oiled for excellent filtration. The original filter element in the Edelbrock air cleaner should be replaced with a new element every 3, 000 miles and sooner in dusty areas.