Solar Track Ball Set Mechanical Ball Roller Set DIY Assemble 3D Mechanical Gear Engineering Solar Powered Model STEAM Sc

Description 1 DIY assembly The assembling process can train a strong logical thinking ability and recover the lost concentration2 Mechanical gear drive Rotate through gears to realize the whole movement process3 Solar powered Converting light eneray into electrical energy Is green and environmentally friendly and there is a battery powered box that can rotate in the sunless placeSpecification Name Solar Track BallMaterial WoodenWeight 350gSize 15x10 5x12cmPackage Included 1 x Solar Track Ball Set