It's a pretty straightforward twist pencil, but it goes on so smooth without tugging or scraping.
I had just been using black (I rarely wear anything else on my waterline) until recently, when I purchased blue and purple. They also have a green. Unfortunately I had some issues with the purple, so I would not recommend that one!! The blue and the black are awesome though.
The black little sparkles, I can't even see them, but the blue one is a little more noticeable. I wouldn't use something super metallic on my waterline, but these look great.
I had been using gel liners on my upper lash line, but I wanted to give these a try to see how they worked out.
This is just to show how it looks- there is nothing else on my face:
I would definitely recommend giving these a try. I used them frequently last week with shadow, and they lasted until I took my makeup off. They are so easy to use, very smooth and glide across my eyes. They do last a really long time on my waterline, the enitre line will last 4-5 hours before some fading in the outer corners, and that's a record for me. I also got them for 5.99 plus 50% off, and Urban Decay's are $18 I think, but regardless of the price tag, I would definitely choose these for basic colours because they last much longer.