Original Dual-Stage Air Filter completely submerged in Filter Oil. The filter is then massaged to ensure all pores are evenly coated with oil, it is then placed in a temperature-controlled room to allow the oil to completely cure. All you have to do is open the bag and install. AIRFILTER PRE-OILED BETA TRIAL EVO 2T 125/200/250/290/300 09-25 EVO 4T 09-25