This is a replacement cartridge for the Hewlett Packard C9731A (645A) cyan laser toner cartridge which is manufactured by LD and is guaranteed to perform with your HP printer. It replaces the original HP C9731A toner cartridge. LD remanufactured replacement C9731A laser toner cartridges are specially engineered to meet the highest standards of quality and reliability you can expect from LD. Our toners have exceptional yields that meet or exceed the OEM (Original Equipment Manufacturer) page yield for the C9731A. Our remanufactured HP 645A contains up to 85% new parts including wiper blades, OPC drums, an electronic smart chip for accurate toner level readout and other internal components. While most competitors simply refill the toner cartridge and hope the drum and other key components last, we fully disassemble the toner cartridge and rebuild it to ensure the highest quality prints. High quality LD remanufactured C9731A toner cartridges are an economical and sensible alternative to expensive OEM C9731A (HP 645A) Hewlett Packard laser toner cartridges and supplies. The use of LD remanufactured replacement laser toner cartridges and supplies does not void your printers warranty. LD remanufactured laser cartridges are not remanufactured by HP. LD Products offers a two year 100% Quality Satisfaction Guarantee on our LD remanufactured C9731A cyan laser toner cartridges. For use in the following printers: Color LaserJet 5550n, Color LaserJet 5550hdn, Color LaserJet 5550dtn, Color LaserJet 5550dn, Color LaserJet 5550, Color LaserJet 5500, Color LaserJet 5500hdn, Color LaserJet 5500n, Color LaserJet 5500dtn. We are the exclusive reseller of LD Products brand of high quality printing supplies on Newegg.