dhl ship fareplacement ing pad breathable mask gasket respiring pm2.5 activate carbon filter insert mat for all kinds of n03

fareplacement ing pad breathable mask gasket respiring mat for all kinds of n03 h.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.