Product review (3 stars): If you have a Kenmore Humidifier...
These filters are not meant for humidifiers that curve the filter elements like my Kenmore because these have glue strips on both sides which prevent the filter from bending. HOWEVER, I was able to slowly, gently, peel off the glue strips on one side of the elements so that I could bend them. Since it is still summer, I have not been able to use them yet, but I did mount them in the humidifier and they fit fine. The construction appears to be very similar to the Kenmore elements I have used in the past (other than the glue), so I suspect they should work out fine.