dhl mask kids mouth pm25 ship200 suitable pm2.5 kid pad for k kf94 2 1 face

200 pad for kids famouth mask pm25 suitable for k kf94 2 1 face j.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.