This is the Canon CLI-571 XL magenta printer ink cartridge. It is an Ink Tank type cartridge that is filled with 11 ml of ChromaLife100 ink that can be used to print both documents and photos. When used with a PIXMA 7700 series printer it is estimated that it will be possible to print up to 400 10x15cm colour photos. That amount will vary depending on the printer the CLI-571 XL cartridge is used with but this XL version will print twice the amount a standard sized version. The standard and XL versions of this magenta ink tank along with the other colours and black are available at Just Ink and Paper.