5 слоев 12,5 * 8см взрослого рот маски маска фильтр pad подушка анти рм2,5 бумага заменяемые серы

5 layers 12.5*8cm adult mouth mask pad anti pm2.5 paper replaceable s er.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.