ARMOR Filters Insert / Replacement Filter For reusable mask

This is the Armor Filters Insert / Replacement Filter For Cotton Reusable Face Mouth Mask Features: Replacement Filter ONLY Cotton reusable mask sold separately Please Note: This is a Non-Returable item These filter are 10-ply filters 97.425% effective at filtrating down to 0.5 microns These filter are 10-ply filters and are 97.425% effective at filtrating down to 0.5 microns. These have been tested and received verified certification."