The original Hewlett Packard Q7551XD dual pack comes with two HP 51X high-yield black laser toner cartridges which are professionally designed to produce the highest quality printouts for your Hewlett Packard laser printer. Brand new, original HP 51X toners are ideal choice laser toner cartridges for your Hewlett Packard printer. HP 51X laser toners deliver excellent, dependable results, page after page. You can depend on HP Q7551XD toner cartridge twin pack. 100% Satisfaction Guarantee.