одноразовая 3 слоя прокладок безопасности dust взрослых рм2,5 активировать угольный фильтр и haze дыхание маска pad активированный уголь дых

disposable 3 layer gasket safety dust and haze breath mask pad activated carbon breathing s 10 30 50 pcs 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.