I stockpile these in bulk.

I LOVE THIS PRODUCT. I use this daily so I keep at least 4-5 in my makeup stash at any given time. I love the brush tip that never seems to fray, the almost never-ending ink that doesn't smudge, and the easy handling for drawing both super skinny water lines and thick, dark, dramatic cat eyes.

I'm sorry the previous reviewer had so much issues. I've never had a problem with this product since I discovered it in Seoul a few years ago!
Use with an eye primer (I use Urban Decay Primer Potion in Original) and you will have NO problems with transfers, smudging, or flaking. To remove, all you'll need is a a gentle swipe with a cotton pad + eye make up remover (I use Neutrogena Oil Free Eye Make Up Remover).

I can't say enough good things about this product! Highly recommended for those who like dark pigment and a semi-soft brush tip.