All-metal Stirling Engine Model Set. Easy to assemble: The hot cylinder, hot cylinder sleeve, power cylinder sleeve and power cylinder are integrated and easy to assemble This model is in the form of parts, exercise ability, all metal structure can be repeatedly disassembled Suitable for: People over 8 years old, through convenient use, you can more intuitively observe the operation of the Stirling engine size: 16 x 6 x 7.45 cm Colour:As Shown Material:Metal Package 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.