I knew my shark needed a filter change but didn't really know how bad it was until I checked the filter to make sure I was ordering the right one. My vacuum didn't work as well as it used to and as soon as they were delivered I dropped them and left. I was just vacuuming yesterday and picked up so much junk. I'm very happy to get 3 replacement units at this price so now I don't have to wait for things to get that bad. It fits right in, although the smaller filter that goes in the back was tight. (The one that blows air.) So far so good with catching dust, dander, dog hair, etc. Shipping was on time and honestly faster than most things I get on Amazon. Very satisfied