[ Simple] The product is and has been debugged When installing the product power cylinder, you need to gently rotate the belt, pay attention to use 95% ( self-provided), do not add water, kerosene,, oil, liquor [ Size] 12.5x9cm / 4.92x3.54inch By operating the engine, children will observe and understand the process of the Stirling engine, understand the working principle of the Stirling engine more intuitively, and deepen their interest in physics [] Metal + Wire + Quartz Glass + Quartz glass and gears are The base, bracket, flywheel, heating cylinder, and connecting rod are all metal, which is sturdy and, and is not easily damaged during the assembly process [ Innovative design] Creatively combine the Stirling engine model with the toy car, using the Stirling engine model as the power, driving a simple toy car to walk, with playing methods and fun [ Wide range of application] This model kit has a wide range of applications, such as children ' s science projects, physics / mechanical learning, teachers, classroom demonstration props,, family members, parents, children ' s birthday gifts