Description: 【Educational DIY Set】: Science Education Toy is designed to help children understand the effects of pulleys and gravity. Ideal teaching tool for scientific experiments, providing practical applications of physics and encouraging hands on. 【Enhance learning ability】: Physical Toy allows children to understand scientific principles through model construction, enhance learning ability, and cultivate hands on ability and awareness. 【Sturdy Material】: Gravity Trolley Science Toy is made of ABS pp, cotton thread and metal parts, which is sturdy and not easy to be damaged, ensuring long term use. 【Ideal Gift】: Physics Kits Toy is an ideal gift for children, allowing children to discover new fun in learning through hands on gaming experience, providing children with multiple ways to play and learn. 【Application】: DIY gravity Car can be used as a teaching model, science competition, scientific experiment model, educational assembly toy, etc. Suitable for children and teenagers to play. Specification: Material:PP and cotton thread and metal Size Chart: 11cmx24.5cm/4.33inchx9.65inch Package Includes: 1 Physics Kits Toy Note: Please allow slightly errors due to manual measurement and different monitors.