The tube has two ends. At one end is some sort of white foundation substance, and at the other end, regular mascara-colored mascara. You apply the white stuff first, then immediately put the black stuff over it. It made my lashes so long I look like I have on false eyelashes. FUN!
(For those who have little patience/time for make-up, you won't like this two step process. For those who, like me, can spend hours playing with cosmetics, get some! It's way cool!)