Sell Safety Care Reusable PM2.5 filters with 5-layer protection (Set of 12) best price

- Each PM2.5 filter has 5 layers of protection. Filter layers consist of Activated Carbon, 2 Anti-adhesion cloths, and 2 Melt-blown filters. - Can be used by both kids and adults. Please check filter dimensions photo to make sure it can fit into your cotton mask filter sleeve. - Filters cannot be washed but can be reused up to 7 days when worn in uncrowded places. Replace filter immediately when used in a hospital or other places with higher rate of contamination.