The product is strictly sterilized before they come out of the factoryWhat are the five layer filtering materials? The first layer: non-woven fabric filtering The second layer:active carbon filtering The third layer:filtering cotton The fourth layer: high-density filtering cotton The fifth floor:soft non-woven fabricFunction:Protect from Dust, Allergies, Smoke, Pollution, Ash, Pollen, Crafts, Gardening, Germs, Travel，and so on Attention: Dust Mask is designed for airborne dust, pollen and particulates. Although the internal active carbon layer can play good gas filter role , it does not intend to protect from the harmful gases. Guarantee: If for any reasons you are unpleasure with your purchase, please feel free to contact us. We provide friendly, easy-to-reach support.Dimension:Display width 22cm, Disply height 18cm Package: 6 Pack Dust Mask
