All-metal Stirling Engine Set. Easy to assemble: The hot cylinder, hot cylinder sleeve, cylinder sleeve and cylinder are integrated and easy to assemble This is in the form of parts, exercise ability, all metal structure can be repeatedly disassembled Suitable for: People over 8 years old, through convenient , 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 Package Contents: 1 x 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 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 Wick 1 x Filling Tool Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.