Calitoner Compatible Laser Toner Cartridge Replacement for HP Q7551X (HP 51X)- Black Print Technology: Laser Printer(s): HP LaserJet P3005, P3005d, P3005n, P3005dn, P3005x, M3027, M3027mfp, M3027x, M3035, M3035mfp, M3035xs mfp Replaces OEM Part #: Q7551X (51X) Cartridge Color: Black Page Yield: Up to 13000 pages, High Capacity