This genuine Epson C13T40D340 ink cartridge is the high capacity magenta cartridge for the SC-T3100 and SC-T5100 inkjet printer series. Containing a full 50ml of Epsons highest quality magenta ink, the T40D3 works out a cost effective purchase for most users.Designed for large format printers, the original Epson C13T40D340s substantial size is for a good reason. Although it is not possible to give an estimated page yield for the T40D3 or similar Epson cartridges, this whole range is one way to keep printing costs low without compromising on quality.