Designed for those who love challenges, the Pro-L line, due to the greater strength of its magnets, allows you to create ever more complex models and structures, giving greater scope to your imagination. The visible polarity indicator on the rods means you get to understand the true potential of magnetism and can build constructions that allow you to push to the edge of the laws of physics with greater ease. STEM Authenticated toy is designed to help children develop hand/eye coordination, motor kills, problem solving, and visualization through the science of magnetic construction. PRO L magnets are stronger than our classic line allowing for larger creations. Helps in the development of creativity, fine motor skills in addition to stimulating imaginative play and curiosity through the science of magnetic construction. Magneti 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.