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 Material:Aluminum alloy + stainless steel colour: silver grey Package Contents: 1 x Base Plate 1 x Flywheel 1 x Cylinder Kit 1 x Heating Tube 1 x Piston 1 x Piston Bar 2 x Connecting Rod 1 x Fuel Shield 1 x Sealing Panel 1 x Cylinder Pad 1 x Flywheel(S) 1 x Flywheel Axis + Rod (4x27) 1 x Driving Piston 4 x M3x4 Screw 4 x M4x6 Screw 1 x Hose Connector 1 x Axis (2x8) 1 x Axis (2x10) 1 x O Ring 1 x M3x3 Fastener 2 x M3x5 Fastener 2 x Pad 1 x Flame Wick 1 x Fuel Filling Tool Only the above package content, other products are not included. Note: Light 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.