breathable gaskets 3-layers ship dhl mask pads anti dust mouth face mask replacemen 1wem

famask pads 3-layers breathable mask gaskets anti dust mouth famask replacement pad 7.1.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.