Here at Ink Guru, we sell high capacity, long lasting 4000TN cartridges so you get more ink inside for less money. When you buy our Ink Guru 4000TN cartridges, you pay less per page! Don't forget that with longer lasting cartridges you'll be buying less cartridges, which helps protect our environment 🌍 These cartridges are guaranteed to replace your 4000TN ink, or we promise to give you your money back.