The PGI-520BK is an inkjet cartridge that was created specifically for printing photos. Because of that, it has jet black ink that gives a very dark impression on your images. Each cartridge offers dark blacks and pure greys for all of your photos and printouts, to ensure that you will always have the best colour combinations in each picture. The cartridge can be used to create professional looking photographs for home and office use. Each cartridge is jam packed of 21.5ml of pure black ink to give you the most out of every single product. The cartridge can be used for different printers, such as the following: Canon IP 4600, Canon IP 3600, Canon MP 620, Canon MP 540, Canon MX 860, Canon MP 550, Canon IP 4700, Canon MP 980, and the Canon MP 630.