DigiToner by TonerPlusUSA New Compatible Replacement HP C4127X (HP 27X) High Yield Black Laser Toner Cartridge for use in HP LaserJet 4000 and 4050 Printer Series (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 laser printer and give your documents outstanding print quality, clarity, and exceptional yields at a LOWER COST. COMPATIBLE PRINTERS: HP LaserJet 4000, 4000n, 4000se, 4000t, 4000tn, 4050, 4050 usb-mac, 4050n, 4050se, 4050t, and 4050tn RELIABLE TONER: Includes 1 Black toner cartridge. Certified ISO 9001 for quality assurance. Environment assured Certified ISO 14001. HIGH YIELD: 10,000 pages based on 5% coverage. 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.