Yes, it's pink eyeliner. What's not to love?
The liner is a little thick, but is fairly spreadable, here you can see it applied both alone and with a little black pencil smudged into the lashes:
I spent Sunday with one eye like this, and one eye naked (it's a dogs life, being a beauty blogger, you know), now, dare I leave the house wearing pink liner (obviously on both eyes)? Would you?