NATIONAL GEOGRAPHIC Magnetic Marble Run - 50-Piece STEM Set for Kids & Adults - Plastic, Magnets, Glass, PaperIntroducing the National Geographic Marble Run, a captivating engineering kit designed to inspire creativity and exploration in physics. Ideal for both kids and adults, this innovative marble race track allows for endless fun and learning through hands on play. This marble run is constructed from high quality materials including plastic, magnets, glass, and paper. The design features a magnetic base, enabling it to be built on various surfaces such as