The product is a New 3-pack of large black ink cartridges from the brand Greenbox, specifically designed for Canon printers. These compatible inkjet cartridges are ideal for printing in black and come with an extra large black ink cartridge from an open box. So, 4 all together. The Greenbox brand ensures quality and reliability for your printing needs, making it an excellent choice for those looking to replenish their printer ink supply.We had just recently bought these ink cartridges, but our printer stopped working.