dhl ship pads dustproof 5-layer pm2.5 cloth pad replaceable nose mouse fashield mask gasket

mask gasket pads dustproof 5-layer pm2.5 mask cloth pad replaceable nose mouse fashield mask gasket 2.1.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.