MIROO High Capacity Replacement for HP 970 971 Ink Cartridge Compatible with HP Officejet Pro X476dw X476dn X451dw X551dw X451dn ( Pack of 4 ) Why Choose Miroo: leading company in new technology for cartridges,focus on quality to provide best products to our customers,competitive price only 18% of the price of the major brands. Why pay more to have the same product and service? Miroo Go. Use With: HP Officejet Pro X576dw X476dw X476dn X451dw X551dw X451dn Printer. Page Yield: up to 9,200 Pages per black Cartridge; up to 6600 Pages per Color Cartridge. Include In The Package: 1 Black, 1 Cyan, 1 Magenta, 1 Yellow .Ink Volume: Black: 240ml, Cyan/Magenta/Yellow: 120ml. Note: Recently,Hp upgrade the printer firmware which use 970 ink, when you received a message" one or more cartridge damaged, please replace it it proves your printer have upgraded and our ink will don't work, please kindly email contact us for solution when that, any other cartridge issues also please email us. Now All our ink is newest, can use on the upgraded printer.