dhl shipwholesale mask pads 5 layers protective pm2.5 dustproof face mask replacement insert activate carbon filter pm

wholesale mask pads 5 layers protective pm2.5 dustproof famask replacement insert pads breathable fy6014 u.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.