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Gravity Crane DIY Mechanical Stem Toys with Instruction Book. The Gravity Crane Kit lets children explore the fundamentals of gravity, pulleys, and lifting mechanics through a fun, buildable crane model. Kids follow the instruction book to assemble the vehicle, attach the pulley system, and experiment with lifting small objects using gravitypowered motion. The project strengthens critical thinking, coordination, and understanding of basic physics concepts. With its colorful design and interactive features, this STEM kit turns learning into an engaging constructionthemed adventure. Ideal for classrooms, home learning, and young builders fascinated by machines.