Hot Deal~ Click Now!
-First layer of spunbond cloth filters micron-level dust
-Second layer filters industrial pollutants, automobile exhaust, second-hand smoke, and pollen allergens
-Third layer of activated carbon cloth filters micron-level dust
-Fourth layer offers filter density for smaller material
-Fifth layer of spunbond cloth filters out all kinds of harmful substances
-Made in China
Good price for masks and filters. Seem to work well. Quick delivery.Very satisfied.