Vertical Type Metal Stirling Engine Motor Educational Toys with Alcohol Burner Features: .100% brand new and high quality .The product is made of high-quality all-metal material, polished, sprayed, and high-end texture. It is a beautiful art piece; .Can be used without over-commissioning. .The key part is usually made of brass and fine coating material, which is not worn for a long time and has a service life of more than 10 years; .The 12mm power piston of the product is made of bearing steel and heat-treated and hardened with precision CNC grinding. With tolerance of plusmn;0.002mm, it can meet the strict airtight requirements and ensure the sliding process of the piston in the cylinder. The whole product is made of ultra-high industrial standard. It is a very good collection. After the product is received, it does not need to be debugged. It can be used when it is lit with alcohol. Safe and pollution-free. .It can drive the matching colorful LEDs and combine them into a pleasing operation effect. .Suitable for model lovers DIY, laboratory teaching aids, children #39;s puzzle play, gifts and gifts for friends. Because the product has high temperature during operation, the child needs to be used under adult supervision; Specifications: .Color: As Shown .Material: Alloy Steel + 7075 Aluminum Alloy + Brass .Flywheel Diameter： 65mm .Belt Pulley Diameter: 25mm .Power Piston Stroke: 16mm .Generating Voltage: 4-9v .Product Size: 9*5.6*10.5cm .Product Weight: 370g .Package Dimensions: 14*8.5*10.5cm .Package Weight: 410g .Packing: Carton Box Package Content: .1 x Stirling Engine .1 x Metal Alcohol Burner