Dust proof, avian influenza, virus, haze, dust, pollen, particulate matter, PM2.5, bacteria, etc. Content:50pcs. 3 layers! With bamboo charcoal technology ,much higher quality than other normal mask !
5A quality Layers of Protection: --SS Non-woven Outer Layer --KNB95 Medical Meltblown Cloth Filter Layer (Filters over 95% of viruses)