Exceptional Quality! Lined vacuum filters, bags, and other parts and accessories have been manufactured for over 26 years. Products works to design and produce top-of-the line high quality and high efficiency products that perform phenomenally at an affordable price! Foam & Felt Filter Kit uniquely designed to work with Shark Rotator Professional vacuums including Models: NV400, NV401, NV402 Lined brand Foam & Felt Filter Kit 4 pack. Compare to Shark part number XFF400. Contains enough filters for a year if replaced every three months. This package contains 4 foam and 4 felt filter replacements. Regularly changing out your filter is very important! Replacing your filter every 3 to 4 months may help reduce odor, improve vacuum performance, increase exhaust air quality in turn improving home air quality, minimize allergies, extend vacuum life, and most importantly help maintain a cleaner home! Our 100% Satisfaction Guarantee! We are so confident in our Lined products that we offer a 100% satisfaction guarantee! If you are unhappy with a product you purchased from us please contact us right away. We will work with you to determine the best possible solution and will be happy to provide a refund, exchange, or replacement! Lined products are crafted from high quality materials to ensure production of products that not only meet but exceed industry standards and customer expectations! Products conducts extensive research and development unique to the industry supporting a steady stream of engineering development and patents. Easy to replace and install. Simply follow your vacuum’s manual for easy removal and replacement of your foam and felt filters. Upon removal please properly dispose of the used foam and felt filters. You will be amazed at how quickly dirt and grime clog up your filters! Breathe clean and experience the renewed freshness of a brand new filter. Filters should always be replaced at least every 6 months. However, replacing the filters every 3 to 4 months is recommended. Manufacturers’ Warranty: Lined Brand products are fully guaranteed against defects in construction and materials. Should a product fail under normal home usage, we will send you a replacement at no charge. Please contact us to arrange having a replacement item shipped out to you. We may request you return the defective item to us for evaluation and testing. All Shark brand names and logos are the registered trademarks of their respective owners. Use of any Shark brand names, part, or model numbers are for the sole purpose of demonstrating compatibility. This product has been created and manufactured as Lined brand product and is not an OEM part.