Our shark still feels great but was in dire need of filters and was as "old" as the target, best buy or one of these Stones are no longer available in other shops. So after a bit of research and nail biting I bought these just in case they didn't fit me (like the last ones I bought from another seller) but thank goodness! They work! The big cylindrical foam thing was the best part, tight and very tight around the center of the part it fits in the vacuum around. It doesn't stretch out to the sides quite like the original, but I didn't notice any negative difference. The rectangular felt on the front is a lot thinner than the original and expels a lot more air, but again the vacuum works and cleans well. The best part is that there are two of these puppies so I can replace the old one while I wait for a new filter order. Will definitely buy again.