This is 4-Pack remanufactured Dell S3840CDN, S3845CDN toner cartridges. Includes 1 each of black, cyan, magenta and 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.