Bulk PM2.5 Activated Carbon Filter Mask Inserts 5 layers - 100 Pack Quantity:1000 Pieces PNG with a black background

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Bulk PM2.5 Activated Carbon Filter Mask Inserts 5 layers - 100 Pack Quantity:1000 Pieces PNG with a black backgroundBulk PM2. 5 Activated Carbon Filter replaceable Anti Haze Masks Filter Protective Health Mask 5 layers Insert Filters 100 Pack 5 Layers Function: First layer: spunbond cloth, filter the dust of micron Second layer: to filter industrial pollutants, automobile exhaust, second hand smoke pollen allergies Third layer: activated carbon cloth, benzene and a smaller function of filtering dust microns Fourth layer: filter density, smaller material Fifth