Children aged 3 to 6 years are in an important phase of eye development. Große MET-Bausteine? The MET-Bausteinset contains a large storage box for children, in which they can store the building blocks after playing. It can help children to develop a good habit of order and order. Different colors of the stones can help small children to sort the colors when they build models. At the same time, the Bauprozess can convey basic technical knowledge about the wheel structure and assembly principle to the children.