These filters feature five layers of pre-oiled cotton gauze media to provide maximum performance. Their progressive layering allows the filters to flow at high levels even when dirty. This media is perfect for street and/or track use. Pro 5R filters are easily recharged with aFe's POWER CLEANER and blue air filter oil. aFe POWER performance air filters use a rounded, evenly spaced pleat design which allows for more usable filter surface area, providing increased flow and greater dust holding capacity. These aFe POWER performance air filters are constructed with a polyurethane base and top. Unlike other materials that degrade after repeated heat cycles in an engine bay, polyurethane maintains its original molded shape. Magnum FORCE Intake Replacement Air Filter w/ Pro 5R Media (3x4-3/4) IN F (4x5-3/4) IN B (2-1/2x4-1/4) IN T x 6 IN H (3x4-3/4) IN F (4x5-3/4) IN B (2-1/2x4-1/4) IN T x 6 IN H