Reusable Face Mask Filter Replacement, Replacement Filters For Klein Tools Reusable Face Mask (Cat. No. 60442) Offer Basic Protection Against Non-Toxic Dust, Pollen, Mold, Dander, & Common Airborne Irritants, These Filters Are Designed To Fit The Klein Tools Reusable Face Mask Only, & Only When These Items Are Used Together Is The Device Usable For Suitable Applications, Made Of 5 Layers Of Non-Woven Polypropylene With A Folding Activated Carbon Layer, NOT NIOSH-Approved; Not For Silica, Asbestos, Mold, Or Non-Organic Chemicals, NOT A Medical Device, (Pack of 3 Filters)