With its magical forces of magnetism, this stem toy, pro-L by Geomag promotes STEM learning and takes creativity to new heights! Featuring 15 steel spheres, 17 silver magnetic rods, and 18 transparent panels, your little builders can build high-tech futuristic structures. The stronger magnets allow for creating models and structures that are more complex than ever before. What's more, with a visible polarity indicator on the ends of the magnetic rods, your little ones will understand and harness the full potential of magnetism. Available in sets of 50, 75, 110 and 174 pieces. The set also includes a manual.