This is a two-sided marker/mascara combo pen. It also comes with a stencil, if you're into that sort of thing. First, you outline and fill your brows with the marker side. The instructions say to leave it on overnight (or at least 6 hours), and then wash your face in the morning, like usual.
The wait time is pretty long, and there's definitely a learning curve to filling your brows with a marker, but the stain it leaves looks nice and natural. Once you add the brow mascara on top, it lightens the effect of the marker, which makes your brows look a lot less harsh.
In my opinion, the mascara is too light for anyone with deep brown to black hair. I'd recommend only using the slightest amount to soften your brows.
This is a two-sided marker/mascara combo pen. It also comes with a stencil, if you're into that sort...