This is 4-Pack remanufactured/compatible Lexmark CX310 / CX410 / CX510 toner cartridges. Includes 1 each 80C1SK0 (black), 80C1SC0 (cyan), 80C1SM0 (magenta), 80C1SY0 (yellow). 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.