сша 5 слои 12.5 * 8cm взрослый рот pad анти рм2,5 дети бумаги для маски одноразового использования, заменяемые сек крышки

usa 5 layers 12.5*8cm adult mouth pad anti pm2.5 paper for mask disposable replaceable s cover 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.