20 40 80 профессионального reptaceable 3-layer mask pad анти рм2,5 активировать угольный фильтр сменного загрязнение свободно дышать для взр

20 40 80 professional reptaceable 3-layer mask pad anti pollution breathe freely for adults dadily life.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.