Seed&reg; (2-PACK of Type XHF500 HEPA Filters) Shark Rotator Pro Lift-Away NV500 NV501 NV505 NV552 HEPA Filter & Foam Filter Kit, Part # XFH500 & XFF500 2-PACK of Type XHF500 HEPA Filters Compare to Part # XHF500 & XFF500 Absolutely Essential for Allergy Sufferers