Description: Material: Low Temperature stirling engine model is made from metal material, ensuring stability and durability DIY Science Experiment Education Model: This stirling engine model is a great educational model for kid's science project, physics learning, suitable for school classroom demonstration Engaging Learning Experience: This Stirling engine can be placed on a warm water cup or coffee cup, it transforms heat into motion and it will keep running for minutes as long as the temperature difference is enough Versatile Application: Stirling engine steam heat engine generator model measures 10cm in height, versatile educational tool, also great desktop display ornament, suitable for home and office decor Nice Gift: Great gift for both adults and kids, thoughtful birthday gift for friends, families, parents, colleagues Specification: Material: Metal   Size Chart: Height: 10cm/3.94inch   Package Includes: 1 Stirling Engine Generator Model Note: Please allow slightly errors due to manual measurement and different monitors.