2 Packs of 10 PCS PM2.5 Filters for Face Masks (20 pcs total)

-2 Packs of 10 PCS PM2.5 Filters for Face Masks (20 pcs total) -Replaceable PM2.5 Filter -Provides 5 extra layers of filtering protection in addition to cotton mask -Not washable or resuable -Recommended to use with the cotton face mask with built in vent valve -Keep a layer of face mask fabric between filter and your mouth (Use with face masks that have an open slit in mask that allows filter to be slid inside) -Recommended lifespan of 3-4 days (Replace every 3-4 days) -Packaged in pack of 10 pcs