Product review (1 stars): Waste of money
I bought these for a Vicks V3900 Germ Free humidifier.  They are too small (narrow.)  I bought 2 packs (4 filters) and have to throw 3 of them away because I cannot return them.  Waste of money.  Buy a more expensive filter that actually fits the product.  Packaging says that it fits a V3900 Series and it does not.