aFe 10-10133 Magnum FLOW Pro 5R Air FilteraFe 10 10133 Magnum FLOW Pro 5R Air Filter Pro 5R Filter Media: This filter features five layers of pre oiled cotton gauze media to provide maximum performance. Its progressive layering allows the filter to flow at high levels even when dirty, while its inverted top makes for more filter surface area, resulting in longer service intervals. This media is perfect for street and or track use. Pro 5R filters are easily recharged with aFe's POWER CLEANER