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
MONTESA
315R 97-04
4RT 250-260 05-Present
4RT 300-301 16-Present