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Five Layers of Filter Protection: 1st layer of spunbond cloth filters micron-level dust. 2nd layer filters industrial pollutants, automobile exhaust, and pollen allergens. 3rd layer of active carbon cloth filters micron-level dust. 4th layer offers filter density for smaller material. The fifth layer is the inner layer of non-woven fabric, comfortable and breathable, resistant to dirt, so that wearing more sanitary. Product Specification: -- Filter material: : Non-wovenCloth,Melt-blown cloth.activated Carbon --Package Included: 50 pcs Filter Notes: 1) The color maybe a little difference compare the image with actual item due to monitor reflect. 2) If any question, leave us a message, we will keep in touch with you.