Geomag PRO-L 388 pcs, our largest PRO-L set, will stimulate your child's developing mind and channel their creativity. Your little engineer-in-the-making will gien the tools to build architecturally sound structures like a bridge using panels, magnetic rods, and non-magnetic steel spheres. With a little imagination, they can build something more fantastical and abstract! This STEM.org certified toy is designed to help children develop hand/eye coordination, motor skills, problem solving, and visualization through the science of magnetic construction. PRO L magnets are 30%+ stronger than our classic line allowing for larger creations. STEM.org certified toy that helps in the development of creativity, fine motor skills in addition to stimulating imaginative play and curiosity through the science of magnetic construction. • Magnetic construction platform that helps kids grasp science concepts in magnetism and magnetic polarities • Helps kids gain knowledge in engineering concepts by creating a remarkable number of structures and configurations through trial and error • Designed to help stimulate children's creativity by allowing for expanded play possibilities • Promotes hands-on learning and offers a creative approach to problem-solving by building 2D shapes, 3D shapes and graduating to larger and more complex structures • STEM.org authenticated