Pro 5 Air Filter Blue 10.5 x 2.0/12 Inch H x .04 W/14 Inch H x 2.5 Inch W/ 6.0 Inch Oval VolantVolant's high performance 5 layer air filters are made of the highest quality textiles, pleated between a top and bottom aluminum screen. Each filter comes pre oiled and ready for use. This design will allow the highest air flow rate possible and a very long filter life. Use Volant's two stage cleaning kit to thoroughly clean and re oil the filter. We recommend cleaning the Pro 5 filter only when very dirty or when you reach around 12,000 miles.