HP 645A Cyan LaserJet Toner Cartridge (C9731A)
Get the best results from your HP printing system. HP Smart technology and chemically-grown toner formulas in HP 645A LaserJet Toner Cartridges work with your printer to deliver accurate, consistent color and reliable, cost-effective performance.
HP LaserJet 5500 series
HP LaserJet 5550 series