5 insert layers pads disposable mat child activated carbon replaceable s mask pm2.5 filte 7s9p

disposable face replacement ing pad breathable mask gasket respiring mat for all kinds of n12 features: 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.