Superb Choice Remanufactured Ink Cartridge Replacement for HP 950XL/951XL(Black/Cyan/Magenta/Yellow) use in HP Officejet Pro 8600 Premium Printer Pack of (1 Black, 1 Cyan, 1 Magenta, 1 Yellow) Ink Cartridges 1 year replacement warranty,30-day refund guarantee after the purchase. Replacement for Original Model: HP 950XL/951XL(CN045AN CN046AN CN047AN CN048AN) Compatible Printer: HP Officejet Pro 8600 Premium Not fit for the printer which produced after March, 2015. And also not fit for the printer which you have upgraded the firmware to FDP1CN1502AR.