Toner Refill Store carries only the highest quality Premium Compatible and Remanufactured inkjet cartridges. The HP OfficeJet Pro K550 inkjet cartridges from Toner Refill Store is 100% guaranteed to meet or exceed your expections and surpass the print quality of the OEM (Original Equipment Manufacturer) HP OfficeJet Pro K550 inkjet cartridges. Many HP Inkjet Printers carry a black and a color inkjet cartridge. Toner Refill Store carries the black, cyan, magenta, yellow, and tricolor inkjet cartridges. We also carry the print heads for many HP Printers. Print heads will need to be replaced eventually when your print quality diminishes. The use of our premium compatible and remanufactured inkjet cartridges and print heads for the HP OfficeJet Pro K550 does not void your printer's warranty. Our HP OfficeJet Pro K550 high yield inkjet cartridges have a 'One Year 100% Satisfaction Guarantee'. We also carry the OEM Inkjet Cartridges for your printer.