• WHAT IS INCLUDED IN THE LEARNING TOY: Our construction gearbox toy set has colorful gear kits. The transparent casing allows kid for a clear view of the internal structure of the gearbox. Using simplified assembly models to understand the complex operating principles of gearboxes, allowing children to understand the operation between gears, and improving their hands-on and creative abilities. Like science games provide child with Infinite ideas. Good for children ages 6-8 to build a logical thinking system.