This will be the CRAZIEST thing you ever do with pens! xxxxxxxxx will introduce you to the concept of coloring in 3D! For $20, you get 3D glasses, 2 sets of special coloring pens, 7 (that's 7!!!) posters, and instruction on how to get your colors to pop, drop, and xxxxxx. This is a great deal, and these poster packets make unique gifts! This may be the funnest thing you do all summer--don't miss out!