This is the eyeliner I use haha. I recommend the Merzy The First Pen Eyeliner to anyone looking for a great value eyeliner haha. You can create delicate lines with the soft brush tip, and the color payoff and longevity are excellent. Also, since it is waterproof, it doesn't smudge even in water, so I found it great for daily makeup haha.
I love it, especially in the summer, because it doesn't smudge even with sweat.