shippinglot mask filter fareplacement pad breathable pm2.5 gasket mat for all kinds of gga3322-8 0mef

lot mask pad fareplacement pad breathable mask gasket mat for all kinds of gga3322-8 g.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.