Product review (5 stars): these wicks fit perfectly & work great
These humidifier filters work very nicely, not sure why some people have complained that they are thinner than the old one.  They seem to work just as good as my original thicker humidifier wicks that came with the humidifier.  I usually get an extended use out of them by soaking the wicks in a solution of a pan filled with water + 1/2 to 1 cup of vinegar solution once the mineral deposits have hardened on and the filters, reducing the humidifiers effectiveness.