40pcs box 5 слой рм2,5 activate углерода маски фильтра цикла прокладка замена противотуманно щитки для кожи дышащий рот маски

40pcs box gasket replacement anti-fog protective pads skin-friendly breathable mouth mask 34v6.1.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.