factory ship3 fadust dhl 1 pm2.5 half gas reusable ,mask pad holder and nose only chang 8ldl

3 1 factory outlet half fadust gas mask reusable ,mask liner pad holder nose and nose only change the mask liner dust,white p.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.