I've been using my nv105 Shark for over 5 years, I've only bought filters and accessories from the Shark website. Now that my vacuum is a bit dated I decided to see if any of these third party filters would work well. Not only do they work well, they look and work just like shark filters. To be honest, if the old filters weren't dirty I wouldn't know which is which. I wish I could buy them from day one and will continue to buy them, I could get eight sets for the price of one shark filter set.