Each one is in it's own little plastic container. After researching, I found that you dip the pen in your ink, and squeeze the clear plastic sac until it fills with ink. Pretty awesome.
I'm so glad I found these. I will probably put them up for sale in my etsy supply shop soon, but I just couldn't wait to share. I've still got to decide how much to sell them for, since they're kind of valuable. I found one here with a starting bid of $15.00. Crazy! I think these could make some really unique gifts or favors.