одноразовая маска pad прокладка рм2,5 5-слои для 2.5 маски анти-смог загрязнением пыли

single packaging 3 layer disposable facial mask pad non-woven protective breathable cotton mat for extend mask lifespan 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,