original carbon activate non weave filter pm2.5 activate mask pad box of 100 pieces skin-friend p9hg 29f16

mask pad mask pad box of 100 pieces skin-friendly breathable and universal pad waterproof dust and fog l.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.