Feature:1. STABLE FIXING: This Stirling engine contains 8 hot and 8 cold cylinders for a total of 16 cylinders, which is very stable on the wooden base2. EDUCATIONAL SCIENCE TOY: By operating a stirling engine, you can gain a more intuitive understanding and learning of structures and principles. An excellent popular science toy to help develop children's interests3. USED AS TEACHING PROPS: Wide range of applications of great gift for kids science projects, physics or mechanical learning, classroom teaching props4. BIRTHDAY GIFT OR DECORATION: Stirling engine model can also be a birthday gift for friends, family, parents, children, etc., as well as home decoration5. LONG USING TIME: Hot air stirling engine kit is wear resistant, not easy to be damaged, and the use time is longHow to Use:Follow the user manual.Specification:Item Type: Stirling Engine ModelProduct Material: Aluminum alloy + mahogany + stainless steel + plasticProduct Size: Approx. 20 x 10 x 15.5cm / 7.9 x 3.9 x 6.1inScope of Application: For children's science projects, physics or mechanical learning, classroom presentations, etc.Weight: 1024 g / 36.1 oz(approx.) Package List:1 x Stirling Engine Model1 x User Manual24 x Flamethrower1 x Wrench4 x Rubber PadNote:The temperature of the model that has just been operated is high, do not touch it, the cylinder piston connecting rod cannot be filled with any lubricating oil, and dust can be gently wiped with toilet paper or cotton cloth.