Description: 【Electrical Bell Science Experiments】 This is an electromagnetic relay physics instrument kit, a simple and effective way to demonstrate the principles of electromagnetism 【Compact Size】With a base measures 156mmx105mmx100mm, easy to handle, so that this experimental demonstration is more intuitive, and is easier for students to observe state of all compents and learning 【Educational Tool】Ideal for physics teaching and learning, this physical electromagnetic experimental teaching equipment is suitable for middle school physics experiments science education 【Material】DIY electric science experiments learning kit is made of pp and metal materials that ensures its longevity and functionality 【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, Metal     Size Chart: 156mmx105mmx100mm/6.14inchx4.13inchx3.94inch Package Includes: 1X Electric Science Experiments Kit   Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.