Toner cartridge helps boost efficiency in Hewlett-Packard LaserJet 600 M602n, M602dn, M602x, M603n, M603dn, M603xh; M4555h MFP, M4555f MFP, and M4555fskm MFP. Enhanced HP toner fuses quickly to documents for fast printing with outstanding quality. Print crisp text and sharp, black graphics page after page. Original HP LaserJet toner cartridges are designed and tested with the printer for consistent results. Cartridge yields approximately 24,000 pages.