HQRP 2-pack Replacement Foam Felt Filter Kit; | | Compatible with Shark part 461FFJV390; | | Fits all vacuums in the HV390 series; Compatible with SharkFLEX DuoClean HV390, HV391, HV392, HV394Q Corded Ultra-Light Upright Vacuums; | | Washable and reusable; Clean once a month; For optimal performance, please replace the filter every 3-6 months. | | Easy to install and replace; 2 weeks DOA replacement ! | |