BMC Air Filters offer better air flow to your engine with the use of pre-oiled cotton gauze filter elements. BMC filters utilize a wider filter surface area compared to stock, while retaining a 7 micron filtration capability. The choice of champions: BMC equips some of the most important race teams in MotoGP, World Superbike and Formula 1.; The cotton gauze BMC uses has larger links, allowing a better air flow, but using several layers of oil soaked cotton allows to block any impurity larger than 7 microns Greater retention and screening BMC air filters scored an impressive 97.5% filtration efficiency at ISO5011 test Wider filtering area Maximum air permeability and higher air flow passage