The HP 645A is a family of original LaserJet toner cartridges (C9730A, C9731A, C9732A, C9733A) that includes black, cyan, yellow, and magenta options for professional, high-volume color printing. These standard-capacity cartridges feature chemically-grown toner formulas and HP Smart technology for reliable, consistent color reproduction and cost-effective performance in compatible HP Color LaserJet 5550 printers. The black cartridge yields approximately 13,000 pages, while the color cartridges yield around 12,000 pages, with actual yields varying based on print content.
HP® 645A Black LaserJet Toner Cartridge (C9730A) https://share.google/bUMUfBR7YtEIJNdnz