BMC Air Filter FM01119_BMC_AIR. The materials used are the best currently available on the market. The filters are made from a single rubber frame to prevent any possible breakage. The filtering element is made of a special cotton fabric (4 layers) soaked in an oil with low stickiness. It is covered by an aluminium net treated with an epoxy solution to be resistant to petrol fumes and oxidation. Moreover, the cotton has the advantage of being washable and reusable. Thanks to these features, the BMC sports air filters (replacement air filters) guarantee a higher air flow rate compared to the original paper filters used, a minimum pressure loss of the incoming air and therefore lead to a better performance of the engine. Durability: washable and reusable, no need for replacement – Wider filter surface – Maximum air permeability (4 layers of cotton) – Higher absorption and filtration – Better pressure drop ratio – Tested by international testing procedures. 1x BMC Air Filter. Product Type: Air Filter. You can send us a message by using the “Questions and answers” section towards the bottom of the page.