The zoob pieces are designed around the ball and socket joint which enable children to build creative exciting models that can be manipulated and moved in ways that we haven't seen in any other construction toy. In a Zoob building day in our shop we had children as young as three and as old as thirteen creating unique models. Both boys and girls were eager to join in. The age recommendation on the product is based on the complexity of the models that can be created. It is not safe for children under the age of 3.