This is the Canon CLI-551 XL black ink cartridge and it is capable of printing twice as may photos as its standard sized version. The XL does not mean the cartridge is bigger though! It just contains more ink in a slightly larger internal space than you’ll find in a standard one. This means it will fit the same printers but, per penny, will print more. The quality of the ChromaLife100+ ink is exactly the same and the results will be just as good but ultimately they will be cheaper. Order this black ink cartridge online now and choose standard delivery to receive your cartridges in 3-5 working days for free!