Toner cartridge helps boost efficiency in HP LaserJet Enterprise 600 M601n, M601dn, M602n, M602dn, M602x, M603n, M603dn; and LaserJet Enterprise M4555 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 cartridge is designed and tested with the printer for consistent results. Cartridge yields approximately 10,000 pages.