Premium Quality C4127X High Capacity Black MICR Toner Cartridge compatible with the HP LaserJet 4000, 4000N, 4000T, 4000TN, 4000se, 4050, 4050N, 4050T, 4050TN, 4050se. The use of compatible supplies does not void your printer warranty. Product Detail Ninestartechonline.com