K&N Universal 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. This Part Fits: Year Make Model Submodel 1971 1973 Honda CB500 Base 1975 1976 Honda CB500T Twin DOHC Base 1976 1977 Honda