Toner cartridge delivers trouble-free printing, page after page, for peak office efficiency, day after day, in your Hewlett-Packard LaserJet P3015 Series, Enterprise 500 MFP M525f, Enterprise 500 MFP M525dn, Enterprise Flow M525c and LaserJet Pro MFP M521dn. Uniquely formulated HP toner, the proven all-in-one cartridge design and built-in intelligence make Original HP toner cartridges the time-saving, cost-effective choice. HP 55A cartridge yields approximately 6,000 pages.