1 2 layer одноразовые прокладки safe анти пыль дышащий рот face mask рм2,5 замена pad комфортное pad

3 pcs half face dust gas mask reusable ,mask liner pad holder nose and nose only change the mask liner dust,white features: 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.