dhl ship gasket set non woven pm2.5 mask filter activate carbon soft daily anti dust pad 11.8x8.8cm

mask gasket set non woven soft daily anti dust pad 11.8x8.8cm f.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.