Containing 12ml of ink the Hewlett Packard T6N04AE is the high capacity black cartridge in the range. The top-quality genuine ink within the HP 303XL black ink cartridge offers you an estimated 600 prints according to Hewlett Packard, making this unit ideal for a busy home office.The high capacity HP 303XL can be used in a variety of printers aimed at home users including the wonderful Envy Photo 7134 All-in-One. Problems with genuine Hewlett Packard products are more than rare, but should you experience any problems the manufacturer offers a full guarantee for the T6N04AE directly.