This genuine Epson T40D1 ink cartridge is the high capacity black cartridge for the SC-T3100 and SC-T5100 inkjet printer series. Containing a full 80ml of Epsons highest quality black ink, the C13T40D140 works out a cost effective purchase for most users.Designed for large format printers, the original Epson T40D1s substantial size is for a good reason. Although it is not possible to give an estimated page yield for the C13T40D140 or similar Epson cartridges, this whole range is one way to keep printing costs low without compromising on quality.