пакет 3layer прокладка safe анти пыль дышащей водонепроницаемой замена рм2,5 активировать угольный фильтр заменяемой маску pad 0slr

pack 3layer gasket safe anti dust breathable waterproof replacement mask pad 0slr.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.