Features: 1.It is easy to assemble and has collection value. It can be used as a pendulum or school experiment supplies. 2.The heat energy is converted into the mechanical kinesthetic energy of the engine, and it can be operated by hands to grasp the working principle of its low temperature more intuitively and deepen the interest in physics. 3.The bottom plate is made of brushed stainless steel, exquisite and beautiful. 4.Widely used for children's science projects, physics/mechanical learning, and demonstration props for teachers in the classroom. 5.Scientific designs of the overall structure to assure system integrity and stability. specification:Condition: 100% Brand New Item Type: Stirling Engine Material: Stainless Steel PackageList:1 x Hot Cylinder Piston1 x Stainless Steel Cylinder1 x Cold Cylinder Piston3 x Nut1 x Silicone Air Pipe1 x Hot Cylinder Assembly1 x Cold Cylinder Assembly1 x Connecting Rod Ventilation1 x Connecting Rod Seals2 x Buckle3 x Sealing Ring(Assembled on the product)1 x Belt1 x Motor1 x Diode1 x Screwdriver1 x Hex Socket1 x Large Flywheel1 x Small Flywheel1 x Rear Bracket6 x Screw1 x Large Bottom Plate1 x Foot Pad1 x Ethanol Tanks1 x Lamp Cover1 x Wick