SPEED Remanufactured Ink Cartridge Replacement for HP 901 ( Black , 2-Pack ) HP 901XL Black ink tank contains 20ml, yields up to 750 pages per cartridge @ 5% coverage. HP 901 Color ink tank contains 21ml, yields up to 500 pages per cartridge @ 5% coverage. Compatible Printers: Officejet 4500 Wireless, Officejet J4680, Officejet J4550, Officejet 4500, Officejet J4540, Officejet J4580. Print Effectiveness: Make printing smoother, natural looking images and fewer granularities, producing best looking prints ever. Inks stop to come out automatically when printing is over. Technology: SPEED ink cartridges are adopted the leading Print Head Cleaning Technology, Print Head Testing Machine Technology, Eco Friendly Technology, Zero-energy Technology. The cartridges underwent an extensive process including, cleaning, testing the chip, ink vacuum refilling, totally pass to 27 production lines. All cartridges reach the standard when they are tested in any severe environment. Warranty: CE, TUV, ROHS, ISO9001, ISO4001 International Quality Certified.