We offer the best option if you want to avoid the kind of expenses often associated with the equivalent original toner cartridge without sacrificing print quality and page yield. The Compatible HPQ7551X (51X) High Yield Black Toner cartridge provides the same quality and page yield as equivalent original toner cartridge. This Compatible HP Q7551X (51X) High Yield Black Toner cartridge is manufactured under stringent quality standards and comes with 100% Satisfaction Guarantee which means that you can be assured that it will deliver the quality you expect from your HP laser printer. HP51X / HP7551X