dhl shipwholesale black valve pm2.5 activate carbon filter dustproof pad fagood performandurable breathable reusable 3d mesh flter qaby7w

wholesale black valve dustproof pad fagood performandurable breathable reusable 3d mesh flter mask outlet q.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.