Description: 【Product】: 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 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: Metal Size Chart: 48.5cmx10.5cmx8.5cm/19.09inchx4.13inchx3.35inch 45.5cmx12cmx8.5cm/17.91inchx4.72inchx3.35inch 45.5cmx11.5cmx9cm/17.91inchx4.53inchx3.54inch Package Includes: 1 Set Simple Pendulum Experiment Device   Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.