Ink jet printing is a method used to print on the jacket of various cables or components. The letters and numbers are 'shot' onto the cable in a dot-matrix format. Therefore the print quality is not as good as a print wheel but the legend ("writing") can be changed instantly. Some cable markings, such as consecutive footage numbers, can only be done by ink jet printing. Other things, such as logos or symbols, are difficult or impossible with ink jet printing.