Our compatible Brother LC121BK/LC123BK black compatible ink cartridges are filled with an incredible 16ml of high quality compatible ink. These cross compatible cartridges come fully chipped meaning they are compatible with a vast number of printers that use both the LC121 and LC123 range of Brother ink cartridges. Designed to give a page yield in excess of the high capacity Brother original LC123BK ink cartridges you can expect at least 600 pages from these cartridges (with an average 5% page coverage). However this LC121BK/LC123BK compatible cartridge still comes with a bargain price tag.