Based on knowledge and experience gained on the track, BMC developed a proprietary production system based on soft rubber molding which produces the familiar BMC red filters. Each is made in one piece with no welded joints thus avoiding breakage. The filtering material is composed of a special cotton gauze soaked with low viscosity oil and covered with an epoxy-coated alloy mesh to ensure protection from gasoline fumes and oxidization due to humidity. Furthermore, the cotton has the advantage of being washable and reusable. BMC air filters guarantee superior airflow compared to traditional paper filters enabling minimum loss of power in the airflow and thus obtaining better performance from the engine. All BMC performance products are tested and developed in a process of continual evolution, and are designed to satisfy the requirements of the most demanding motorcyclists. Higher airflow than O.E.M. filter for maximum power. Race-tested for performance and reliability. Endorsed by Yoshimura. BMC Air Filter Basics: The panel / cylindrical air filter is commonly referred to as a "replacement air filter." It is installed in the vehicles original airbox to replace the O.E.M. air filter. The BMC Air Filter is made of high-performance materials which allow an increased airflow combined with more efficient filtration, and guarantee containment of all impurities from as small as 7 microns (compared to the O.E.M. 10 microns). BMC air filters are produced using a "Full Molding" system that enables the characteristic red filter to be realized from a single mold with no welded joints thus avoiding easy breakage. The rubber used in BMC air filters has a long life, is very durable and has optimum adhesion characteristics with all shapes of airboxes. All BMC air filters are pre-oiled, and they can be washed and refreshed by using the appropriate BMC Air Filter Cleaner Kit (sold separately).