This is 4-Pack compatible / remanufactured Lexmark 50F0U0G (TAA Compliant Version of 50F0UA0) 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.