Made with 100% polyurethane on all four sides, the high-flow, oiled OE replacement performance filter will outflow the stock paper filter by up to 38% for improved horsepower and torque. The PRO 5R air filters use five layers of progressively finer mesh cotton gauze media to provide maximum airflow for best performance results. Washable and reusable for multiple cleaning cycles, the tall, open, evenly spaced pleats provide excellent dust holding capacity for a longer service cycle between cleanings. An integrated urethane bump seal insures tight, no leak seal over the life of the filter.