Premium Quality C4127X Jumbo Capacity Black 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