dhl shipaccessories 5 ply activated pad pm2.5 activate carbon filter replaceable anti dust smoke gas and allergies mask in stoc qa6a6m

accessories pm2.5 5 ply activated carbon pad anti dust and smoke gas and allergies mask in stock 7.1.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.