Product review (5 stars): Tight fit, but great price!
For the price, these are great. They are a tight fit for the filter tray, so expect to "work" with it into the tray. (I use them along with the Holmes Humidifier Bacteriostat.) I suggest purchasing that too, it extends the life of the filter so much. Without the bacteriostat, the filter may last 3-4 months. With the bacteriostat, the filter lasts 9-10 months.