Made from durable polyester material containing uniform micron openings, the DryCharger® will stop small dirt particles and is water repellant, yet adds little restriction to the airflow of your filter, Specially designed filter wrap made to extend the service interval of your K&N air filter when used in severe dusty or wet conditions, Features double-stitched elastic openings to secure drycharger in place, Designed to be run dry and can be cleaned with K&N filter cleaner, Custom fit to each application, Made in the U.S.A.