Aztech 55X CE255X Compatible For HP 55X CE255X Toner Cartridge For HP LaserJet P3015dn P3010 HP LaserJet P3015x P3015 P3015d P3015n HP Laserjet Pro 500 MFP M521dn M521dw M525dn M525f Printer 2-Pack 6900 PAGES PER CARTRIDGE 0.0018 PER PRINT, COST SAVING IS REAL FRIENDLY & PROFECTIONAL PHONE IN SERVICES GUARANTEE HAPPINESS, REPLACEMENT / REFUND? IT'S YOUR CALL COMPATIBLE WITH PRINTERS: HP LaserJet Pro 400 M401a M401d M401n M401dn M401dne M401dw, LaserJet Pro 400 MFP M425dn M425dw