TonerPlusUSA Compatible Toner Cartridge Replacement for HP Q6511X ( BLACK , 1-Pack ) HIGH QUALITY: Because TonerPlusUSA's extensive research and development, this compatible replacement HP toner cartridge is guaranteed to be easy to install with your HP laser printer and give your documents outstanding print quality, clarity, and exceptional yields at a lower cost. COMPATIBLE PRINTERS: HP LaserJet 2420, 2420d, 2420dn, 2430, 2430n, 2430t, 2430tn, 2430dtn YIELD: 12,000 @ 5% coverage RELIABLE TONER: Includes 1 Black toner cartridge. Certified ISO 9001 for quality assurance. Environment assured Certified ISO 14001. 100% MONEY BACK GUARANTEE: If, for whatever reason, you don't absolutely love your print quality, just return it, and we'll replace it or give you 100% of your money back, no questions asked. We're that confident that you'll love your print quality, and will continue to use our products in the future.