The edding FUNTASTICS WINDOW FUN window markers for children can be used on a variety of surfaces. It's best to use them on non-porous surfaces such as glass, window panes, transparencies, etc. The ink will be easy to remove from these types of materials. With their vibrant, opaque colours, the edding FUNTASTICS WINDOW FUN fibre pens for children are ideal for use on dark paper surfaces.