Description: 【STEM DIY Set】This is a Mechanical Transmission Model, so some simple assembly work is needed before using it. After you have assembled it, you will play it with a great sense of accomplishment. 【Easy Assemble Toy】Mechanical Transmission Model Chain Friction Gear Belt Gear Transmission Principle Physical Mechanics Equipment 【Desktop Decoration】Office Desk Decor, Show some character and express your love for science and physics with this decorating your office space. 【Kids Experiment Toy】For Kids Handmade, educational classy experience the visual display of momentum, use this in class and share with your friends and family the exciting world of physics and science. 【Quality Material】Kids Educational Intelligence Developing Toy made of sturdy pp. Learn basic physics principles and conduct experiments with these potential energy demonstrator to study physics. Specification: 22x15cm/8.66x5.91inch   Package Includes: 1 DIY Physical Scientific Kit