mask pad non-woven carbon original active pm2.5 filter fabric mask-replaceable layers for face 2i3z

mask pad pm2.5 non-woven fabric mask-replaceable layers for famask protective products v.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.