All-metal Stirling Engine Model Set.Easy to : The hot cylinder, hot cylinder sleeve, power cylinder sleeve and power cylinder are integrated and easy to This model is in the form of parts, exercise , all metal structure can be repeatedly disassembledSuitable for: People over 8 years , through convenient use, you can more intuitively observe the operation of the Stirling enginesize: 16 x 6 x 7.45 cmColour:As ShownMaterial:MetalPackage Contents:1 x Stirling Engine Model(unassembled)Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.