Description: 【Inertia Demonstrator】: This Inertia Demonstrator is designed to effectively demonstrate Newtons's First Law of Motion, making it an ideal educational tool for physics and mechanics experiments 【Material】: Constructed from pp, this inertia demonstrator is built to withstand regular use in classroom or lab settings 【Compact Size】: With dimensions of 173x113x125mm, this demonstrator is conveniently sized for easy handling and storage while providing clear visibility during demonstrations 【Educational Tool】: Good for teachers and students alike, this device helps illustrate the concept of inertia by showing how stationary objects remain at rest until acted upon by an external force 【Wide Application】Great for home, school class use. Also ideal Birthday and Christmas gift for kids, children in middle school, can enjoy DIY experiments fun while learning basic physical science knowledge Specification: Material: PP Size Chart: 17.3cmx11.3cmx12.5cm/6.81inchx4.45inchx4.92inch Package Includes: 1 Set Inertia Demonstrator Physics Teaching Equipment   Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.