dhl shipmask replacement fliter pm2.5 pad activated carbon insert pack protective mask inner pads breathable hy8000

mask replacement fliter activated carbon insert pack protective mask inner pads breathable hy8000 s.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.