The HP 80 ink cartridges are designed to work with HP 80 printheads and printhead cleaners. As part of a modular ink system, HP 80 ink cartridges are formulated to provide professional results that are always clear, always sharp. The higher capacity (350 ml) cartridge is ideal for high-volume, overnight, or unattended printing. And like the HP 80 printheads, the ink cartridges feature built-in smart chips to ensure excellent results without guesswork. The HP 80 ink cartridge is the perfect choice for users who produce precise black-and-color line drawings or high-quality color renderings, maps, and graphics. Compatible With HP Designjet 1050c Printer (C6074A) HP Designjet 1050c Plus Printer (C6074B) HP Designjet 1055cm Printer (C6075A) HP Designjet 1055cm Plus Printer (C6075B)