High-yield toner cartridge delivers optimum text and graphics print quality in your Hewlett-Packard LaserJet 4250n, 4250tn, 4250dtn, 4250dtnsl, 4350, 4350n, 4350tn, 4350dtn and 4350dtnsl. 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 20,000 pages.