aFe Filter GUARD Pre-Filters protect your performance air filter and extends your filter cleaning intervals by removing large particles like twigs and bugs from the air stream prior to the air filter. This pre-filter is made of a dry weave fabric that does not attract dirt and cleans with soap and water. Made out of dry weave polyester fabric, the pre-filter repels water and dirt with minimal effect on air flow. Easily cleaned with soap and water. Pre-filters protect your performance air filter and extends your filter cleaning intervals. Each pre-filter is made for the filter its paired with. Protection and Simplicity. This kit comes with 2 pre-filters.