. HP 55 LaserJet Toner Cartridges provide trouble-free printing and consistent results page after page. Office printing runs smoothly with the Original HP toner cartridge using Original HP toner. And you can rely on the environmental leadership of HP. Black12500 pages (HP LaserJet Enterprise P3015 and Pro 500 MFP M521) or 13500 (HP LaserJet Enterprise Pro 500 MFP M525).. .