Pack of 10x interchangeable Activated Carbon Filters to be used with the FR1 Respirator Mask.

These filters are rated at PM2.5. The PM2.5 rating will block Particle Matter (PM) of up to 2.5 microns in size which includes smoke and smog and will also absorb viruses, bacteria and gases. With daily use, the filters are effective in filtering for up to a week.