SMARTMAX allows children to explore magnetic properties and build structures in a whole new way! Features oversized bar magnets in different colors and sizes, plus large magnetic balls. 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. Sets also feature metal balls, which attract all colors, and can be attached to several bars at once. The Start Plus set includes 12 short bars, 6 long bars, 4 curved bars and 8 metal balls, plus an instruction booklet. For ages 1 and up. Compatible with other SMARTMAX sets.