рм2,5 активированный уголь взрослые 5 layers вставить защитный вставка для mouth маска dust-proof фильтрации pad рм2,5 реактивировать угольн

pm2.5 activated carbon adults 5 layers insert protective insert for mouth mask dust-proof filtration pad ooa7814.1.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.