Product review (1 stars): NOT as pictured
These filters are NOT WF813 filters.  Instead I received two jumbo filters that look to be for a whole-house humidifier.  What I should have received are the filters pictured on the box, which should be the size of a household sponge.  These things can't even fit into a mailbox to be returned, and it's not worth the hassle at holiday time to stand in the ridiculous lines found at the post office for a $6.99 mixed up purchase.  So I'll take the loss, but wanted to warn others that if you are ordering these filters for your small, room humidifier do not be fooled by this picture.  Instead of getting what is pictured you will instead receive something completely different.