I was sent several Eyeko "Graffiti Eyeliner Pens" to review. I really love these pens. So far I've only used the black and brown and they have great lasting power and can be applied lightly or heavily depending on how dark you want the line. It is EXTREMELY easy to make a very thin line because each pen is tapered and comes to a very small, sharp point. At first these reminded me "Sharpie Markers"! haha. I definitely wouldn't put permanent black marker on my eyes though... These are probably the easiest/quickest liquid eyeliner application I have ever used.