1. First layer of spun-bonded cloth filters micron-level dust
2. Second layer filters industrial pollutants, automobile exhaust, second-hand smoke, and pollen allergens
3. Third layer of activated carbon cloth filters micron-level dust
4. Fourth layer offers filter density for smaller material
5. Fifth layer of spun-bonded cloth filters out all kinds of harmful substances
Contents:
3x 5 Layer Replacement Filter For Dual Valve Sports Mask