Product review (5 stars): My bad but the company said they would refund if I ...
I was worried about whether or not these would fit because I bought the humidifier at a thrift store but it came with instructions.
Then I accidentally bought a quantity of two 3-packs instead of just one.  My bad but the company said they would refund if I
sent them back.  I didn't.  They work well and you can actually rinse them out a few times and reuse them before they fall apart completely.