This is a set of 10 filters and 2 nose wires to insert into the mask. This should be disposed after each use and the wire needs to be removed before washing the mask. These are NOT for the duckbill style masks.
Material: Nonwoven Dust Cover Fabric (polypropylene). This is one of the layers in a N95 mask and the only one that is commercially available. You can also cut up a hepa filter from a vacuum cleaner, a dried non scented wipe and use any kind of thin wire you have at home.
Disclaimer: I am not a scientist or in the medical field and make no claims to the effectiveness of this product.