Washable and reusable high-efficiency air filter. The FCd (Full Contour design) technology allows the entire surface of the entrance to the air filter box to be used as a filter medium. This increases the filter zone between 20-80%, increases airflow and improves engine performance. The higher air passage further reduces fuel consumption. The DNA filter medium consists of four layers of special DNA cotton fabric, which are sandwiched between 2 grids of plastic-protected aluminum. these are held together in pairs with an aluminum wire braid. Due to the special folding technique of the filter medium, the inner radius is increased and provides more filtration. Maintenance advice: The filter should preferably be cleaned and oiled once a year or at less than 15,000 - 30,000 km. The filter must not be used without oiling, otherwise the filter medium will not provide optimal filter performance. Only DNA service products may be used for cleaning and oiling! Main color black Type/type Item Variation replacement air filter