Made with 100% recycled plastic, Geomag MASTERBOX Supercolor Panels 388 pieces uses powerful magnetic rods, steel spheres and panels, allowing children to create unlimited structures. Panels provide a way to create rigidity in every structure thus allowing taller and larger structure to be built. Great introduction to STEM activities. Designed to help stimulate children's creativity by allowing for expanded play possibilities and promotes hands-on learning by offering a creative approach to problem-solving. Helps in the development of fine motor skills with endless construction possibilities. Geomag