Superb Choice Remanufactured Ink Cartridge Replacement for HP 901XL Combo (1 Black, 1 Color) Pack of 1 Black 1 Color Ink Cartridges 1 year replacement warranty,30-day refund guarantee after the purchase. Replacement for Original Model: HP 901XL Compatible Printer: HP OfficeJet 4500 G510a G510g G510n J4524 J4540 J4550 J4580 J4624 J4660 J4680 J4680c