5 пыль маски фильтра колодки доказательство replainner колодки для рот маска рм2,5 анти мутность рот сменная ы

5 dust proof replainner pads for mouth mask pm2.5 anti haze mouth replaceable s.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.