Feature: 1. APPLICABLE OCCASION: A wide range of applications, suitable for children's science projects, physical machinery learning, classroom demonstration props. 2. APPLICABLE PEOPLE: Suitable for people over 8 years old, easy to use, and can observe the operation of the Stirling engine more intuitively. 3. EASY TO ASSEMBLE: The model is in the form of parts and has strong athletic ability. All structures can be repeatedly disassembled and assembled, which can exercise hands on ability. 4. ZINC ALLOY MATERIAL: Adopts high quality zinc alloy material, which is safe and durable, not easy to be deformed, corrosion resistant and wear resistant. 5. INNOVATIVE GIFT: DIY Stirling engine model, it is a great holiday gift for anyone interested in science, suitable for friends, family, parents, children, colleagues, etc. Specification: Item Type: Stirling Engine Model Material: Zinc Alloy Weight: Approx. 429g / 15.1oz Base Plate Size: Approx. 15.9x5.9cm / 6.3x2.3in Scope of Application: For children's science projects, physics and mechanical learning, classroom presentations, etc. Applicable People: Over 8 years old, easy to use, can observe the operation of Stirling engine more intuitively. Package List: 1 x Base Plate1 x Flywheel1 x Cylinder Kit1 x Ethanol Bottle (Without Liquid)1 Bag x Accessories (36Pcs in Total)5 x M3 Screw4 x M4 Screw1 x Chinese and English Manual Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3. There is no liquid in the ethanol bottle.