CIAJIE Remanufactured HP 901XL Ink Cartridge High Yield Compatible with HP Officejet 4500 J4500 J4540 J4550 J4580 J4680 J4624 J4524 (Black+Color) These CIAJIE cartridge refilled high quality Waterproof Ink cartridges are produced under strict quality guidelines in accordance with ISO9001.All cartridges have been two tested one by one prior to packing and ensure smooth printing Technology:All cartridges are adopted the leading Print Head Cleaning ,Print Head Testing Machine and Eco Friendly Technology,The process Test chip, opening the lid, pick sponges, increasing capacity, washing, drying, check the filters, Packing sponge, vacuum refilling, sticky cover, test, replace the chip, testing, sealing film, packaging. Ensure Compatibility, No Plug, No Color Cast, Bright Colorful ,Green,Eco Friendly- Save the Environment, save your money is really the best Printer Compatibility: HP Officejet 4500 J4500 J4540 J4624 J4580 J4680 J4550 J4524etc ISO-9001 and MSDS certificate approved, 12 month limited warranty