filter shippinglot skin carbon activate pm2.5 for friendly gasket fog prevention mask replacement pad anti dust s46k 138un

lot skin friendly mask gasket mask pad fog prevention mask replacement pad anti dust p.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.