... kinds of colors, children's writing or drawing with it, regardless of where to write, can be ... can also disappear, without leaving any trace.With this magic pen that allows children to practice writing, but ... wallpaper,cloth or sheet,you just wipe it with water,the writing disappeard at once,it can ... .Repeatly used,economy and beneficalV-CLEAR doodling pen,with the durability of 1 year,can be used ...