Made of metal, enabling the model sturdy and . Metallic texture and appearance an eye-catching desktop decor. DIY unassembled Stirling model kit, enhance hands-on ability, experience the fun of assembly. Fuel is anhydrous ethanol. after filling the fuel, wait for the water to boil, then gently push the , it start to rotate. Water needs to be added to the to produce steam to make the it rotate, very easy to operate. Mute design, give you a comfortable environment and don't disturb others. A fantastic gift for science project, Physical/mechanical learning, teacher's Demo props on the class, inspiring interest in science and physics learning. colour: as shown Material: metal Size: 116x90x130mm Package Contents: 1 x Stirling Engine Model Kit 1 x Chinese and English Assembly Instructions 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.