Product review (3 stars): Suspicious
As another reviewer has mentioned, these wicks arrived in clear plastic bag inside a blank cardboard box.  I have no way to tell if they are what the seller claimed them to be.
I will say that these ones did not last nearly as long as the wicks I used before.  They do not have the metallic strip running through the middle like the previous wicks had.  They collected dust much faster and had dark patches which looked like mold after a few nights of use.
Still, they fit my Duracraft DH-830 humidifier and they did work for a while.