Cool Toner 2PK Compatible for HP 55A CE255A 55X M521dn Toner Cartridge for HP Laserjet Pro 500 MFP M521DN M525DN M521DW M525f HP Laserjet P3015dn P3010 P3015x P3015 P3015d P3015n P3016 Printer Toner Compatible Toner Cartridge for Original HP CE255A 55A Black Toner (Compatible for HP 55X CE255X Toner) High yield : 6,000 Pages Compatible for HP 55A CE255A CE255X 55X M521dn Toner Cartridge Compatible Printer - HP LaserJet P3011, HP LaserJet Enterprise P3015D, HP LaserJet Enterprise P3015DN, HP LaserJet Enterprise P3015X, HP LaserJet Enterprise P3016, HP LaserJet Enterprise 500 MFP M525F, HP LaserJet Enterprise 500 MFP M525DN, HP LaserJet Enterprise flow MFP M525C, HP LaserJet Pro 500 MFP M521DN, HP LaserJet Pro 500 MFP M521DW Service - Phone services for technical support : 3-years ; Replacement or Refund upon request