The Skullerz 8810F(x) Contoured Face Cover Mask Replacement Filters are compatible with the Skullerz 8802F(x) Contoured Face Cover Mask for enhanced filtration. These 3-layer poly cotton filters are not Reusable and should be properly disposed of after each use. Ergodyne Disposable Cotton Polyester Blend Not Rated Small/Medium All- Purpose Face Mask in White | 48845