This is 4-Pack compatible HP LaserJet M552, M553, M577 toner cartridges. Includes 1 each CF360A (black), CF361A (cyan), CF363A (magenta), CF362A (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.