The mask body is made of non-woven fabrics (inner and outer layers) and polypropylene melt- blown fabrics (middle layers)for disposable use. The specifications in L / M / S / F code, non-sterile with duckbill and butterfly types are available. It can filter the particles in the air, and block the droplets, blood, body fluids and secretions. It is safe and reliable. The overall filtering effect is good. The materials used are non-toxic, harmless and comfortable to wear.