SMARTMAX allows children to explore magnetic properties and build structures in a whole new way! The cold color bar magnets (blue, green and purple) have their north poles directed outwards. The warm color bar magnets (orange, red and yellow) have their south poles directed outwards. This way, all cold bars will connect with all warm bars. The larger the bar, the stronger the attraction will be. Contains six curved bars. Use this extension pack to add pieces to sets, or replace lost parts. For ages 1 and up.