Features: This engine is a balance style, different from the regular stirling model. It is mainly constructed by metal so it can run quietly and stably. Durable and anti-rust. Heating cylinder for the custom-made thick glass material, long-term heating without pressure; The bottom plate is made of durable wood, exquisite and beautiful. Fill the burning container with 95% alcohol and light it. Let the light burn the round ended cylinder for about 60-120 seconds, then give the wheel a gently push, it will run like a charm. Great gift for kid science project, Physical/mechanical learning, teacher’s Demo props on the class, birthday gift for friends, families, parents, kids. This versatile model can be used in various settings such as classrooms, laboratories, and even at home. It serves as an excellent tool for teaching, demonstrations, and personal exploration. Specifications: Color: Gray; Wood Color Material: Metal; Wood Size: Approx. 17.5x9.5x11.5cm/6.88x3.74x4.52in Weight: Approx. 560g Package Includes: 1 Piece Stirling Engine Model note: 1.Please allow 0-1cm error due to manual measurement. make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you