1 lot famask non-woven fabrics breathing s mask replacement activate carbon filter inner pad gasket ljjk2055 4hxr

1 lot mask gasket famask pad non-woven fabrics breathing s mask replacement pad inner pad gasket ljjk2055.1.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.