Features:Enhance children's science knowledge: The endless fun building toys encourage kids learn, ideal building kits for kids ages 8-12, great for educational and entertainment purposes.Encourage Learning:The race car is powered by a solar panel, the wind car, and the biplane glider are powered by battery and motor(battery not included).Gift:Made of non-harm and wood. Perfect school project. Great toys for kids gift for birthday, children's day, Christmas, summer camp activities or back to school.No welding and glue:Easy Self-Assembly.Our mechanical toy is cut with exquisite lasers technology Includes all the parts except batteries. No need for screws or tools Improve your child's imagination and creativity by challenging them to build their own models.Service:If you have any question,please contact us to provide great service.Notice:1.Actual color may be slightly different from the image due to differentlight effect2.Please allow 1-3cm deviation due to manual measurementDescription:Material:WoodenSize:18.5cm *13cm *4cm