Geomag is based upon a very simple concept - magnetism. The Geomag system consists of precision moulded plastic coated bars with a south-polarised magnet at one end and a north-polarised magnet at the other. The rods are simply connected together using nickel plates steel spheres. Using the magnets power to attract or repel a vast range of static and mobile structures can be created. Contains 24 glow in the dark rods, and 18 spheres.