The HP No 344 twin pack contains two 344 tri-colour ink cartridges and is a great way to buy printer ink and save money. The tri-colour ink is incredibly versatile and is also compatible with a huge range of printer models. Each of the tri-colour printer ink cartridges in this twin pack are potentially able to produce up to 570 standard printed pages. In order to achieve the maximum number of prints certain conditions must be met. The pages themselves should be printed on high quality paper, the ink must be stored correctly and the printheads inside the printer must be clean. If you would prefer to just buy one colour ink cartridge on its own you can order the HP No 344 single cartridge. You can also order HP 339 either as a Single Cartridge or a Twin Pack.