Watch in amazement as the planets flip and rotate around endlessly! Made of metal and plastic, it makes a great conversation piece and decoration for space themed parties. Measures about 25cm tall and 23cm wide. Ideal decoration for home, office, or classroom. Fun and useful gift for children who are interested in learning about magnets and physics. Once the gadget is assembled, all it takes is one push and the “galaxy” will continue to rock back and forth until the battery needs to be replaced. Powered by one 9 Volt battery (not included). The small “planets” are 1.22cm in diameter, and the large one in the center measures 2.4cm in diameter.