The Canon PG-580 and Canon CL-581 ink cartridge are suitable for the same printer models, but differ in ink color. The PG-580 ink cartridge is black and the CL-581 cartridges are black, yellow, cyan, and magenta. The Canon PG-580 and CL-581 ink cartridges are suitable for various Canon PIXMA printer models. You can find a list with suitable printers on the product page of the cartridges. Do you print a lot and want to save money? Choose an XL cartridge. These are the same size as regular cartridges, but are filled better.