This nail polish remover comes as a kit, but it is easy and much cheaper to buy refills once you have made your first purchase. I think this product is extraordinary. It is meant to remove glitter polish and it totally does. I have always found glitter polish to be such a pain to remove that I stopped using it because it was just too frustrating. Well, no more! Let's not "save" the glitter for Christmas anymore, we now have a way to remove it before Easter! The starting kit comes with these little rubber caps for all your fingers, that is what you need to make the remover really penetrate I guess. Anyway, I am no chemist, but I can tell you this: it works and it works well. Nothing else matters, right?