HP 645A Original Toner Cartridge. HP 645A toner cartridges work with: HP Color LaserJet 5500, 5550. Original HP toner cartridges produce an average of 71% more usable pages than non-HP cartridges. Original HP Cartridge Yield (approx): ~12,000 pages. Original HP toner cartridges are specially designed to work with your printer to consistently deliver standout results throughout the life of your cartridge. Ensure that your printing is right the first time and every time with HP printer toner: 645A toner. What's in the Box: New Original HP 645A toner cartridge Color: Black - Cyan - Yellow - Magenta