Description: Educational Tool : This inertia demonstrator is a tool for teachers to visually demonstrate the concept of inertia to students, making complex physics principles more accessible and understandable.Versatile : Ideal for use in classrooms or laboratories, this educational toy helps cultivate children's interest in physics through hands on experiences that are both engaging and informativeMaterial: Crafted from wood, this Physical Teaching Aids ensures longevity and reliability during repeated use in educational settingsCompact : This Learning Set is compact enough to be easily handled by both teachers and students while still being large enough to clearly illustrate the principles of inertia Package : The package contains complete wooden inertia demonstrator with a metal ball, ready to be used straight out of the box for your physics lesson or experiment session Size Chart: 18x8x12cm/7.09inchx3.15inchx4.72inch Package Includes: 1 inertia demonstrator 1metal ball Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.