TRUE IMAGE HEC4127X Compatible for C4127X 27X Toner Cartridge (Black, 1 Pack) 1-pack True Image high yield black toner cartridge replaces 27X C4127X Premium quality toner with easy to install design LIFETIME 100% satisfaction guarantee Estimated page yield of 10,000 pages @ 5% coverage based on ISO/IEC 19752 (letter/A4 size) Compatible with HP Printers: LaserJet 4050 4000 4000N 4050N 4050TN 4000SE 4000T 4000TN 4050DN 4050T 4050SE