PM2.5 filter is replacement for filter mask(mask not included). You are suggested to change insert filter at least once 1-3 days according to your actual situation.
5-layer activated carbon filter system protects you from a range of airborne contaminants, such as noxious smells, pollen, smoke, dust and other harmful particles.
Material: PP anti-sticking cloth + meltblown cloth + activated carbon cloth.
Size:4.9''x3.1'' /12.5x8cm. This filter suits for most adult mouth mask with filter slot.
Notices: 1)Disposable supplies can not be washed; 2)People breathing difficult or sleeping is not recommended to use it.
10/20/50 Pcs PM2.5 Filter