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.