A Continuous Ink System (CIS) is a cost-effective replacement for ink-jet printer cartridges. In contrast to conventional cartridges, a CIS uses very large (about 100ml/color) ink tanks, which are connected with tubes to the printhead nozzles. The tanks can be conveniently refilled from an ink bottle - there is no need for syringes. Ink jet printers are the most common type of computer printer; and industry and commerce also use them extensively for special-purpose applications. ... An ink cartridge is a replacable component of an inkjet printer that contains the ink that is spread on paper during printing. ...