Cool Toner 1PK 12,500 Page Compatible for HP 55A 55X CE255X CE255A M521dn Toner Cartridge HP Laserjet Pro 500 MFP M521DN M525DN M521DW M525f HP Laserjet P3015dn P3010 P3015x P3015 P3016 Printer Toner High yield : 12,500 Pages Compatible for HP 55X CE255X CE255A 55A M521dn Toner Cartridge Compatible Printer: HP LaserJet Pro 500 MFP M521DN, HP LaserJet P3011, HP LaserJet Enterprise P3015DN P3015D, HP LaserJet Enterprise P3015X P3016, HP LaserJet Enterprise 500 MFP M525F M525DN, HP LaserJet Enterprise flow MFP M525C, HP LaserJet Pro 500 MFP M521DW M521DN Compatible Toner Cartridge for HP CE255X 55X Black Toner (Compatible for HP 55A CE255A Toner) Guarantee: 3-Years Warranty; Replacement or Refund upon request Service - Phone Services for technical support