This is 4-Pack compatible Okidata C831 Series toner cartridges. Includes 1 each 44844512 (black), 44844511 / 44844510 / 44844509 (cyan / yellow / magenta). Each toner cartridge is manufactured to be comparative to the original in terms of quality and page yield. Extensive testing and R&D have enabled us to produce cartridges that will not only save you monebut also provide a high quality product to ensure long term customer satisfaction.