The Canon CLI-551 XL Magenta cartridge represents great value for money. This is because it holds the potential to print twice as many photos as a standard capacity equivalent. The XL refers to the interior capacity of the ink cartridge and not the external size. If your printer usually uses a standard CLI-551 magenta cartridge this XL version will fit. The ink inside this cartridge, when combined with genuine Canon photo paper, prints in higher quality thanks to the ChromaLife100+ system that protects prints from fading for longer.