dhl shipdust-proof pad protective replaceable dust-proof 5 layer pm2.5 activate carbon filter breathable mask three-layer gasket

dust-proof mask pad protective gasket replaceable dust-proof breathable mask three-layer gasket i.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.