Simply fill the pen with water, and it magically turns the white drawing surface blue upon contact. Once the water dries, the artwork of the little artists disappears as if by magic. This way, the drawing surfaces provide endless fun even on long journeys. Aqua Doodle Travel banishes boredom and also promotes children's fine motor skills. A benefit for parents: there are no stains left behind, and the children's hands stay clean, as they only draw with pure water. Additionally, there are many other great products from the Aqua Doodle range to discover.