These sphere magnets (sometimes called buckyballs/ magnetic balls) are made from Neodymium which is the most powerful of all permanent magnets. Neodymium magnets are used when the strongest magnetic force is required with the smallest volume of magnetic material present. Incredibly versatile these neodymium spheres allow you to create and recreate structures and magnetic sculptures over and over again, providing hours and hours of fun. Studies have also shown that these magnetic balls are great for stress relief within a busy office environment. Through a combination of chaining and folding the geometric, flat and 3D creations are limitless. Whether polyhedrons, polygons, guitars or even cars the creations can only be limited by your imagination.