Free design, easy to handle, smooth and shiny. You can DIY, fill in the roots, gradient, highlight, and try all kinds of things as you like. It turns into foam when you shake it, just like washing your hair. You don't need help from others at all. Even clumsy people can handle it easily, and don't have to worry about unevenness. There is also beauty serum after dyeing, and the hair will be smooth and shiny after applying.