Features: ★ Premium Material: Metal + Wire Rod + Quartz + Plastic. The quartz and the gear are made of plastic. The base, bracket, flywheel, heating cylinder and connecting rod are all made of metal, which is sturdy and durable, and the assembly process is not easy to damage. ★ Novel Design; Creative Design that stirling model combine with car model, it keeps the science experimental and adds to the fun. ★ Superior Performance: By operating the engine, children would observe and know the operational process and more intuitive understanding of the operating principle of stirling engine, deepening interest in physics. ★ Great Educational Toy: classroom or laboratory experimental teaching aids, the best choice gift to students, teachers, children, friends and colleagues. ★ Easy to Operate: Fill the alcohol burner with your 95% alcohol (we recommend this fuel) and light it. Let the light burn the round ended cylinder for about 20 seconds, then give the wheel a gentle push. Specification: Material: Metal, Rubber, Size: 13 x 11.3 x 10cm/5.2 x 4.4 x 4in Weight: 504g/17.8oz Package Weight: 670g/23.6oz Package Size: 21 x 11.5 x 14 cm/8.3 x 4.5 x 5.5in Packing List: 1 x Stirling Engine Car 1 x Alcohol Vessel 1 x Tweezers 1 x Screwdriver 1 x Tool Kit