5 anti shipping6vl32 layers k pads face mouth insert dustproof replacement smog mask activate c tgcs

6vl32 k famouth anti pads 5 layers insert dustproof replacement pm2.5 smog mask gasket protecti y.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.