Feature 1、Heuristic STEM Learning: Combining the four major fields of science, technology, engineering, and mathematics, it inspires children's interest in science and engineering through hands-on assembly, cultivates logical thinking and problem-solving abilities. 2、3 Types of Power Modules and 4 Shapes: Solar energy, saltwater power, battery power, 4 Shapes: Exploration vehicle, engineering vehicle, walker, mechanical dog, learn the principles of each power supply and mechanical transmission, and explore the mysteries of new energy. 3、Safe and Environmentally Friendly Materials: Made of high-quality ABS plastic, non-toxic and harmless, with rounded edges and no burrs, protecting children's delicate skin and giving parents more peace of mind. 4、Parent Child Interaction: Suitable for parents and children to participate in assembly together, enhancing parent-child relationships while also learning new knowledge and improving family fun through games. 5、Enhance Creativity and Imagination: 138 rich components encourage children to unleash unlimited creativity and design more unique models on their own. Every construction is a exercise in imagination, allowing children to grow into little inventors in the game. Item: 4in1 STEM Building Toys Material: ABS Age: 8+ Package Size: 30.3*23.5*6.4cm Package Weight: 460g Package List 1* 4in1 STEM Building Toys(138pcs)