1) Intelligence toy is an old and traditional Chinese intelligence game and has been popular since ancient times. Hiding very mysterious mathematical and physical principles, it is easy to separate within a short time, while difficult to reassemble
2) Try to get out the brown ball,and put it in,it not very simple!
3) Durable and reliable safe non-toxic
4) Materiaal: natural high quality wood
5) Afmeting: 8.0 x 8.0 x 8.0cm