Educational Tool : This comprehensive physics mechanics experiment kit enriches children's extracurricular, helping to develop practical skills and reinforce their knowledge, thereby enhancing their learning experience Material: Crafted from PP, this Mechanics Experiment Box ensures durability during experiments, making it a reliable choice for young learners exploring the principles of physicsCompact: This experiment set is designed to be compact yet comprehensive, providing all necessary components in a manageable size for easy storage and useComplete Set Included: The package includes a full set of tools needed for conducting various experiments related to levers and pulleys as well as ' principles, offering a complete hands-on learning experienceGift: This lever pulley system set makes an ideal gift that combines education with fun, encouraging curiosity and exploration in the field of science Size Chart: 18cmx11cm/7.09inchx4.33inch Package Includes: 1 setMechanics Experiment Box Note: 1.This is not infant toy , please take away from children to avoid eating.2.Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.