This is a creative and interesting miniature wind and hydropower generator, made of safe and durable materials, with scientific design, and is an excellent teaching tool for cultivating childrens practical ability and interest. It has a simple design structure, is easy to install, easy to use, and can easily bring you fun. It is also an excellent model for wind energy teaching experiments. Features -Color: Assorted Color. -Material: Copper, Aluminum Alloy, Rubber, Bulb. -Size: About 14.00X2.50X2.50cm or 5.50X0.98X0.98inch. -Easy to operate, simple and practical, can easily bring you more fun. -It can be used as a wind power teaching experiment. It is an excellent model for wind energy teaching experiment. -Small and practical, with good texture, it can help children understand relevant principles and knowledge very well. -Professional and practical, very suitable for cultivating students and childrens hands-on ability. -It can be used for wind generators and hydroelectric generators. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.