Arlen Ness Replacement Inverted Air Filter Element Features: For use with Arlen Ness Inverted Series Air Cleaner Kits Features synthetic material that never needs oil, just wash and re-use for long lasting performance Synthetic filters are water resistant eliminating the need for a rain sock Each filter features an inverted pleated top with pleated sides to maximize airflow by pulling in from every angle Synthetic material is black with a stainless steel jacket