1、Long Service Life: Made of high quality copper and stainless steel to prevent rust and prolong its service life. 2、Main Features: It is a meticulously designed and manufactured mechanical toy, very suitable for demonstrating the basic principles of external combustion engines. 3、Scientific Overall Structure: Scientific designs of the overall structure to assure system integrity and stability. 4、Scope of Application: Suitable for use in classrooms or laboratories to cultivate children's interest in physics. 5、Perfect Gift: This retro and beautiful Stirling engine is a great gift for friends, family or yourself. 1 x Engine Model1 x Bottle (without liquid) 3 x Hex Wrench1 x Wick2 x Accessories1 x Chinese And English Manual  Item Type: Stirling Engine ModelMaterial: Copper + Stainless SteelProduct Color: As Pictures Shown Product Size: 16x9x14cm / 6.2x 3.5x 5.5inProduct Weight: Approx. 750g / 26.5ozScope of Application: For Children's science projects, physics/mechanical learning, classroom presentations, etc.