FDA Registered and CE Approved.  These 5 Ply Particulate Respirator KN 95 effectively filters non-oily particles to serve as barrier to potential air pollutants that can be harmful. The filtration efficiency of 5 layers will help block out PM2.5 air pollutants like allergens, virus, bacteria, dust, droplets and other harmful non-oil based particles in the air, at least up to 95 percent. It also features an adjustable nose wire to provide proper and comfortable fit to the face contour. 1 box consists of 20 counts of KN95.