This is 4-Pack compatible set of HP 504A/X toner cartridges. 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 money, but also provide a high quality product to ensure long term customer satisfaction. Contains 1 each HP CE250X, HP CE251A, HP CE252A, HP CE253A compatible toner cartridges.