Simple in structure (two to three layers), low bacterial filtration efficiency, mainly used for ordinary medical environments or daily dust and pollen prevention, not recommended for use during high incidence of epidemics. Activated carbon masks ?add an activated carbon layer, which can adsorb odors and some harmful gases (such as secondhand smoke), but have limited protection against bacteria and viruses, suitable for scenarios such as decoration and fumes. Cotton masks ?have good breathability and comfort, but weak protection performance, only suitable for basic protection. Specifications: 50 pieces/package.
