Black Return Program Print Cartridge #28- This high-resolution black cartridge uses Lexmarks exclusive pigmented black ink. This ink coupled with an increased number of printhead nozzles and swath size, enables consumers to consistently produce high-quality prints at unprecedented print speeds. This cartrige contains redundant nozzles, which help ensure consistent print quality. Nozzles are laid out in pairs, so if one becomes clogged or fails, the other continues to print.