I have a Kenmore canister vacuum. I like it very much, but I find it very difficult to deal with it. I use it every other day in the room where I keep my pet birds, so dust, feathers and seeds should get on it. Filters get dirty very quickly. I was cheap and tried buying without buying new filters (by cleaning the old ones) but it really wasn't effective. That's why I ordered them. What difference does it make what they do. They are inserted into the appropriate slot under vacuum (important as they are made by a third party). And I finally have good suction again in my vacuum cleaner (it has suffered a lot lately). Also, it's 2 packs so I always have a spare when I need it. I'm definitely glad I found her. Will order again.