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1.The first layer of spunbond can filter micron-level dust
2.The second layer filters industrial pollutants, car exhaust, second-hand smoke and pollen allergens
3.The third layer of activated carbon cloth filters micron-level dust
4.The fourth layer filter smaller materials.
5.The fifth layer of spunbond filters out various harmful substances
20pcs/50pcs/100pcs * N95 mask gasket