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 assembleThis model is in the form of parts, exercise ability, all metal structure can be repeatedly disassembledSuitable for: People over 8 years old, through convenient use, you can more intuitively observe the operation of the Stirling enginesize: 16 x 6 x 7.45 cmMaterial:Aluminum alloy + stainless steelcolour: silver greyPackage Contents:1 x Base Plate1 x Flywheel1 x Cylinder Kit1 x Heating Tube1 x Piston1 x Piston Bar2 x Connecting Rod1 x Fuel Shield1 x Sealing Panel1 x Cylinder Pad1 x Flywheel(S)1 x Flywheel Axis + Rod (4x27)1 x Driving Piston4 x M3x4 Screw4 x M4x6 Screw1 x Hose Connector1 x Axis (2x8)1 x Axis (2x10)1 x O Ring1 x M3x3 Fastener2 x M3x5 Fastener2 x Pad1 x Flame Wick1 x Fuel Filling ToolOnly the above package content, other products are not included.Note: Light shooting 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.