Product: 10PCS Activated Carbon Filter Replaceable Anti Haze Filter. Filters size: 12 x 8 cm/ 4.7 x 3.1 inches.and 2pcs mouth cover
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.
Note: Filter insert can not be cleaned and should be replaced every 1-2 days. When film or sticky sediment stains emerge.