It's Ink - Haven't had a problem with it but I just installed it. It would be nicer if it was a little cheaper - especially for the people that use HP products over and over.
I recently purchased a 9025e and did not realize that it came with full size cartridges so I purchased these as a backup. So far my printer and cartridges are working fine and think I will get a longer use out of them then others on my previous HP printer.