HP 645A (C9731A) Cyan Original Toner Cartridge for HP Color LaserJet 5500 5550 HP 645A (C9730A) 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 645A toner is designed to work with your HP printer for high quality, reliable results every print. What's in the Box: New Original HP 645A (C9730A) toner cartridge Color: Cyan