Novel Shape: It adopts diamond-shaped connecting rod structure design to reduce lateral force and reduce resistance. Enlarged flywheel design makes it easier to start and run longer. Science Educational Toys: This is an interesting and imaginative desktop technology toy, with dual mini generator load design, more powerful. LED voltage display, real-time viewing of output voltage, four LED lamp beads gleaming, operation in a dark environment will be more attractive. Excellent Manufacturing Process: High temperature resistant stainless steel heating cylinder, durable, stainless steel power piston, precision grinding machine grinding process, brass cylinder liner, precision grinding machine grinding process, good texture and beauty. Simple Operation & Durable: The machine has been assembled and tested, just add 95% alcohol to the alcohol bottle and ignite, and then push the wheel by hand, it can run at high speed. Gifts: This is an amazing and wonderful product, suitable as a holiday gift for technology fans, family, friends, and children. It can be used as a scientific educational toy for studying the working principle of external combustion engines, providing materials for children's scientific projects, inspiring curiosity and creativity, or as a cool desktop decoration artwork. Color: as shown material: metal Package Contents: 1 x Stirling Engine