Instead of standard ink cartridges the G3415 uses a CISS which delivers a high quantity of ink volume constantly to the print heads through an air tight tube. This makes printing large quantities efficient and stable. Print up to 6,000 black text pages / 7,000 color pages, and even more black text pages with the two bonus black ink bottles included in the box. MegaTank’s integrated ink tanks can print up to 30x the amount of ink compared to standard ink cartridge sets. Enjoy the increase in print volume, while not sacrificing the quality of text-heavy documents & borderless photos.