Filled with some of the highest quality pigment-based light grey ink Hewlett Packard have ever produced, each CN634A is capable of an amazing quality of print. The HP 772 light grey and the other colours in this sizable range are a great selection for those that print professionally and need exceptional results.The largest light grey ink cartridge available for any of the compatible large format Hewlett Packard printers, this CN634A keeps your cost per page low, even with this genuine product. With 300ml of light grey ink within each of the Hewlett Packard CN634A cartridges, this is a pretty cost effective product.