Item Type: Engine Model Product Material: Aluminium Alloy, Glass, Bamboo Size: Approx. 11x6.4x6.5cm/4.3x2.5x2.6in Rough Weight: Approx. 285g/10.1oz Scope of Application: For Children's Science Projects, Physics and Mechanical Learning, Classroom Presentations, Etc. Package List 1 x Ornaments 1 x Alcohol Lamp Please allow some error due to manual measurement. 1PREMIUM QUALITY: Stirling engine model is made of high quality aluminium alloy materials and fine craftsmanship to avoid rusting and prolong the service life. 2WIDE RANGE OF APPLICATIONS: Stirling engine motor makes a great gift for children's science projects, physics and mechanical learning, classroom props, birthday gifts for friends, family, parents, kids, etc. 3EASY TO OPERATE: Stirling engine motor toy is simple to operate, so that children can operate their own hands, while playing can also observe the engine model. 4EDUCATIONAL DESIGN: Stirling engine is a heat engine that operates by circulating compressed and expanded gases (working fluid) at different temperature levels, thereby converting heat energy into mechanical work on net. 5EXQUISITE ORNAMENTS: Stirling engine motor toy can be an excellent gift with a novel and unique design, simple and exquisite shape. Both children and adults like this engine model.