prevention famask pad child pad mask lot for kf94 k 2 1 all face 2 lhbq

lot mask pad child famask prevention pad for kf94 k 2 1 all face.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.