Geomag, stylized as GEOMAG, is a magnetic construction toy consisting of a collection of bars, each set with a neodymium alloy magnet at both ends, connected by a magnetic plug coated with polypropylene, and nickel-coated metal spheres. These elements interlock using magnetism, allowing for them to be assembled in various ways.
Geomag was created in May 1998 by Claudio Vicentelli. Geomag products are manufactured by Geomagworld SA, based in Novazzano, Switzerland. To align with the 2009/48/EC law's nickel content regulations for toys, the design was adjusted[when?] to feature spheres coated with a bronze alloy.