Description: 【Comprehensive Experiment Kit】: This expansion experiment material set is designed specifically for demonstrating the principles of thermal expansion and contraction, making it an ideal educational tool for middle school physics and elementary science experiments 【Materials】: Crafted from pp and metal, this kit ensures longevity, allowing repeated use in classroom settings or at home 【Convenient Size】: The handle measures 12cm in length, providing a comfortable grip for students during experiments while ensuring ease of handling 【Complete Set Included】: The package comes as a complete set, ready to use right out of the box, offering everything needed to conduct effective thermal expansion and contraction demonstrations 【Educational Value】: This kit is ideal for enhancing students' understanding of physical science concepts through hands-on learning experiences that illustrate real-world applications of thermal properties Specification: Material: Metal,PP   Size Chart: Length: 12cm/4.72inch Package Includes: 1 Set Physics Expansion Experiment Material Note: Please allow slightly errors 1-2cm differences due to manual measurement.