This high-resolution black cartridge uses Lexmark's exclusive pigmented black ink. This ink coupled with an increased number of printhead nozzles & swath size, enables consumers to consistently produce high-quality prints at unprecedented print speeds. This cartridge 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. The 36 black cartridge reflects a discount compared to alternative cartridges in exchange for agreeing to return the used cartridges only to Lexmark for remanufacturing or recycling.