Three-layer flat mask 0.18 yuan each [from 100,000, available at any time]
A face mask is a sanitary product, generally refers to a device worn on the nose and nose to filter the air entering the nose and nose to prevent harmful gases, odors, and droplets from entering and exiting the wearer's nose and nose, and is made of gauze or paper.
Masks have a filtering effect on the air entering the lungs. When respiratory infections are prevalent, wearing masks has a good effect when working in a polluted environment such as dust.
Masks can be divided into air filter masks and air supply masks.