5 слоев роты маски анти-haze пыл вставки для рм2,5 activate фильтра углерода лицевой маской золы пыльца скашивание пыль колодки для маски бе

5 layers mouth mask anti-haze dustproof insert for ash pollen mowing dust pads for safety mask 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.