K&N PreCharger Air Filter Wrap - BlackThe K&N PreCharger filter wrap is specially designed to extend the service interval of your K&N Filtercharger filter when used in very dusty conditions. They are made from durable polyester material containing a uniform weave. The PreCharger will stop small dirt particles with minimal restriction to the airflow of the filter. Cleanable with K&N Filter Cleaner Cleanable With K&N Cleaner