Product: Elementary school mathematics teaching aid pendulum experiment device, suitable for enhancing your students' understanding of physics concepts Material: Simple Pendulum Experiment Device is made of iron material, which is and sturdy, ensuring its durability and longevity Product Dimensions: The Physics Experiment Device making it compact enough for easy storage and transport but large enough for clear visibility during demonstrations DIY Physics Kits: The Simple Pendulum Experiment Setet can improve kid's interest in physics, strengthen children's knowledge of physical, and improve their hands-on and thinking skills Educational Tool: This device is an teaching aid for elementary school mathematics and physics lessons, providing a hands-on learning experience that can help students better understand abstract concepts in a concrete way Specification: Material: PP and Metal Size Chart: Ball : 8.5cmx5.5cmx3.5cm/3.35inchx2.17inchx1.38inch Base: 44cmx11.7cmx9cm/17.32inchx4.61inchx3.54inch Package Includes: Optional packaging: 1Pendulum Ball Set or 1 Demonstration Equipment with Pendulum Ball Note: Please allow slightly errors 1-2cm differences due to manual measurement.