5 mads shipin layer face stock dhl protective core replacement mask filter pm2.5 pads qa ynnd

in stock famask mads 5 layer pm2.5 protective mask core replacement pads b.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.