Description: 【Material and Durability】: Crafted from PP, this demonstration resistance box is designed to withstand regular use in educational settings, ensuring long term durability 【Compact Design】: With dimensions of 22cmx12cmx5cm, this resistance box is compact and easy to store, making it an ideal choice for classroom environments where space is limited 【Educational Tool】: Suitable for middle and high school physics experiments, this resistance box serves as an essential tool for teaching electrical concepts and enhancing students' understanding of physics 【Easy to uese Interface】: Designed with simplicity in mind, the resistance box allows students to easily adjust and measure resistance values during experiments, facilitating hands-on learning experiences 【Versatile Application】: Suitable for a variety of electrical experiments, this demonstration resistance box can be used across different educational levels to demonstrate key principles in electricity and magnetism   Size Chart: 22cmx12cmx5cm/8.66inchx4.72inchx1.97inch Package Includes: 1x Resistance Box Note: 1.This is not infant toy, please take away from children to avoid eating. 2.Please allow slightly errors due to manual measurement and different monitors.