Description:Principle: The obstacle avoidance wheel is mainly composed of a reduction box and a drive box

The rotation of drive box and the rotation of the wheel depend on the resistance on the optical axis

When an obstacle is encountered, drive box will start to rotate

Material: High quality Kt board material, environmental protection, smooth surface, no burrs, sturdy

Education Toys: Understand structure through the model, learning scientific knowledge and improve learning ability, cultivate children practical ability and knowledge

Unique design:The building is very suitable for display on a table, shelf or showcase in a bedroom, playroom or study area

Gift: The DIY 3D Wooden Puzzle Toy is suitable for kids, suitable for Birthdays and festivals

Size Chart:12cmx3cm/4

72inchx1

18inchPackage Includes:1 diy Experiment Kit Note:Please allow slightly errors due to manual measurement and different monitors