Toner cartridge delivers optimum text and graphics print quality in your Hewlett-Packard Color LaserJet Printers 3600, 3600n and 3600dn. Proprietary automated equipment and ASTM testing methods ensure superior performance from each and every cartridge produced. State-of-the-art, automated filling equipment ensures precise fill weights for each cartridge. Independent testing has verified that this cartridge functions fully until end-of-life while yielding the same or more pages than OEM cartridges. Cartridge yields approximately 4,000 pages.