HQ Supplies &copy; Professionally Remanufactured Replacements for HP 645A Toner Cartridge Set, HP 9730A C9731A C9732A C9733A Toner Cartridge Set (Black, Cyan, Yellow, Magenta) for use in HP 5500n, 5500dn, 5500hdn, 5550n, 5500dtn, 5500, 5550dtn, 5550, 5550hdn Printers WARNING: Avoid poor quality knockoffs from other sellers; order directly from CartridgeDealer to receive the exact product listed and ensure superior quality. CartridgeDealer is the only manufacturer and seller of this product listed. Best Real Savings Option for Corporations, Educational Institutions, Organizations, and Businesses in printing Business (Tax Preparation, Illustration, School related, legal documents, any paperworks, etc...) Level High Quality Printing Prints like Original. Clear, sharp and consistently accurate color results. Cartridges are print tested to ensure print quality and maximum page yield. Copy of Test Page is attached ( 2nd Photo on images) Compatible Printers: HP 5500n, 5500dn, 5500hdn, 5550n, 5500dtn, 5500, 5550dtn, 5550, 5550hdn Printers Page Yield: Black 13,000 and Colors: 12,000 standard pages at 5% coverage