PM 2.5 Replacement Filters (10 pcs/ pack)
PM 2.5 Replacement Filters for Non-Medical Masks
These are PM 2.5 filters with activated carbon. It has 5 layers of protection so it can filter out particles as small as 2.5 microns. For best protection, these filters should be replaced after 48 hours usage. Each pack comes with 10 filters.