1、Intuitive Use: The model allows you to observe the operation of the Stirling engine more intuitively, easy to use, suitable for people over 8 years old. 2、Removable Parts: This engine model is in the form of parts, with strong movement ability, and all structures can be disassembled repeatedly. 3、Professionally Designed: It is a well designed and crafted mechanical toy ideal for demonstrating the fundamentals of external combustion engines. 4、Perfect Gift: This generator model is a perfect gift for anyone interested in science, it can be given to your kids, friends, family, etc, it's great for learning. 5、Multipurpose: Can be used as a teaching tool to demonstrate mechanical, physical knowledge, suitable for children's science projects, classroom presentations, etc. Item Type: Stirling Engine Model Product Material: Zinc Alloy, Composite Wood Bottom Plate Product Size: Approx. 17.9 x 8.9cm / 7.1 x 3.5in Weight: Approx. 428g/15.1oz Scope of Use: for Children's Science Projects, Physics, Mechanical Learning, Classroom Presentations, etc Applicable People: 8 years old and above, easy to use, can more intuitively observe the operation of the Stirling engine 1 x Bottom Plate 1 x Alcohol Bottle (without Liquid) 1 x Alcohol Lamp 1 x Alcohol Wick 1 x Alcohol Lamp Cover 3 x Piston 3 x Hex Wrench 1 x Sealing Circle 1 x Needle Roller 1 x Silicone Tube 1 x Chinese and English Manual