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Balance Stirg Engine Miniature Model Steam Technology Scientific Power Generation Experimental Toy Color:ENGINE we will reply at theEngine principle is intuitive, educational toys, teaching experimental equipment can effectively cultivate children's interest in learning can also be used for classroom teaching, more intuitive and easy to understand. Description: Material: Aluminum alloy,glass Color: Silver gold Size: 160x87x110mm Instructions: Please go to the pharmacy to buy 95% purity alcohol, anhydrous industrial alcohol better. Fill the alcohol lamp to less than two thirds.