Feature:1. Premium Material: Stirling engine model is manufactured with high quality aluminum alloy materials and fine craftsmanship to avoid rust and prolong service life.2. Wide Applications: Can be used as an excellent gift for children's science projects, physics or mechanical learning, classroom teaching props, and birthday gifts for friends, family, parents, children, etc.3. Elegant Gift Packaging: Hot air stirling engine motors are an amazing and dreamy product. Its elegant gift packaging makes it gorgeous and stylish, having a wide range of applications.4. Hand Made DIY: You can assemble with your relatives, friends or family and children, enjoy the fun of hand made DIY, and also enhance friendship and family affection.5. Working Principle: Stirling engine converts thermal energy into mechanical work by circulating compressed and expanded air or other gases (working fluids) at different temperature levels.Specification:Item Type: Stirling Engine ModelProduct Material: Aluminum Alloy Color: As Pictures ShownWeight: Approx. 541g/19.1ozRemarks: Accessory Ethanol Bottle (Without Liquid)Scope of Application: for Children's Science Projects, Physics/Mechanical Learning, Classroom Presentations, etc..Package List:1 x Base3 x Hex Wrench1 x Ethanol Lamp1 x Ethanol Adding Tool39 x Accessories 1 x Sticker1 x Magnet1 x Chinese and English Manual