Madison Element Reusable Face Mask Disposable Inserts, Pack Of 10 (One

Designed to be used with Madison element & 3d reusable face coverings this 5-layer filter adds additional protection to our face covering non-woven inner and outer layers prevent larger dust particles from passing through and provide structure and support for the finer filtration layers polypropylene melt-blown layers prevent smaller particles from passing through the filter, down to a size of approximately 3 microns the activated carbon is a highly microporous filtration layer which absorbs smaller gaseous impurities via chemical adsorption filter should be replaced after 12 hours of use pack of 10 filter inserts