See your child build an interactive magnetic marble run and cannon mechanism using Geomag Mechanics Gravity construction platform that combines the force of magnetism with mechanical construction. Geomag Gravity Magnetic Track 115 pieces stimulates children's creativity, inventiveness and a hands-on approach to problem-solving. Once the cannon is built children can challenge other players to see who scores more goals. In addition to magnetic rods and steel spheres, Geomag Mechanics Gravity adds mechanical elements within the construction platform that allows for expanded play possibilities. 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.