Magic air pens are literally magical. They come from the Centropen workshop. The set contains 4 basic colours and two colour-changing pens, which let you change colours — these are sometimes also called "colour erasers". However, the colour doesn't actually disappear, it just changes to a different colour. The packaging shows which colours the pens will change to once applied. One colour-changing pen is the classic type known from school, and the other is an air pen.