SmartMax allows children to explore magnetism safely. The oversized pieces are specifically designed for handling by young kids as they learn about the effects of magnetic attraction and repulsion. Older children will have fun using the pieces to construct towers and bridges. The magnets are strong enough to carry up to 60 times their weight. This set is an extension set only. It is made as an add-on to the SmartMax Basic Sets. This set includes 6 additional metal balls. Ages 3 and up.