Kn95 Protective Face Mask Color White Layer 4 Material Non-woven fabric, melt-blown fabric, heat-seal cotton BFE 95% Function Anti-smoke, dust-free, influenza virus, Pm2.5 particulate matter, exhaust particulate matter. Application daily use,hospital, laboratory,food industry,dust free workshop,electronic manufacturers,etc. Standard GB2626-2006KN95 Packing 1pcs/box