упаковка уплотнитель anti-haze square dust-proof рм2,5 маска фильтр дышащий безопасный здоровья полости рта facotton мат

pack gasket anti-haze square dust-proof breathable safe health mouth facotton pad mat.1.the first layer: high efficient filter cloth filter the dust of micron.2.the second layer: meltblown cloth to filter industrial pollutants, automobile exhaust, second-hand smoke pollen allergies.3.the third layer: high efficient filter cloth filter benzene and a smaller function of filtering dust microns.4.the fourth layer: activated carbon cloth filter density, sma.