Stirling Engine Model Physics Science Experiment Toy with Bulb Meaning and Value: The product itself has been assembled, which has the value of collection, can be used as a decoration, and can be directly used to operate the experiment, which is simple and convenient. Education and fun: Through the hands-on operation, you can observe the operating process of the entire engine power generation, more intuitive understanding of the Stirling engine power generation principle, deepen the interest in physics learning. Specifications: .Material: Metal Package Content: .1 x Stirling Engine Model The package does not contain alcohol