Toner cartridge helps boost efficiency in HP LaserJet Enterprise 600 M601n, M601dn, M602n, M602dn, M602x, M603n, M603dn; & LaserJet Enterprise M4555 MFP. Enhanced HP toner fuses quickly to documents for fast printing with outstanding quality. Print crisp text & sharp, black graphics page after page. Original HP LaserJet toner cartridge is designed & tested with the printer for consistent results. Cartridge yields approximately 10,000 pages.