5 pads layer dhl child shiplot insert protective mat anti haze mouth replaceable s 9cdi 11e8o

lot 5 layer child mask pads insert protective mat anti haze mouth replaceable s pm2.5 mask pad o.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.