I was sceptical about these double ended mascaras. I couldn't see how they would make any difference to the overall end result. But they do, I'm not scientist so I don't konw how but this really does work. The first coat, the white wand, builds up and lengthens the lashes so noticeably and the black coat adds colour. Maybe it's just because you see it in a contrasting colour you NOTICE the mascara lengthening your lashes and it's doing the same as a mascara with just the one wand, and it's just an illusion that it's any better. All I know is I noticed my lashes instantly getting longer. Only downside is having two layers needed for each application, you get half as much product for the size of mascara, so it doesn't last that long. Still, they say you should change your mascara regularly, so maybe it will just promote better make up habits !!