China Hair Chalk Overview The Hair Dye Pen includes 10 hair dye pens in a set that unscrews and is ready to use, with 36 colors to choose from. It is actually a disposable hair coloring tool that can make your original hair color change in a few minutes. It's easy to use, just apply the color to your hair like a painting, and it can be applied to dry or wet hair. The Hair Dye Pen is ideal for...