Wooden Mechanical Ball Roller Set DIY Assemble Mechanical Gear Engineering Electric-Powered Model STEAM Science Experime

Description 1 Wood from Siberia Fine grain strong toughness not easy to crack Select the first class raw materials quality assurance all details are carefully screened to ensure high quality standards2 3D Laser Cutting Technology Error control in a smal range reserve wood material deformation space of humidity and temperature difterence in different regions3 Interactive potential energy pendulum You can make a machine move without batteriesElectric Wooden Mechanical Ball Each model design adopts UG mechanicalenergy principle design dozens of previous revision hundreds of bayonet optimization countless motion plan deliberation so that all details are accurateSpecification Name Wooden Mechanical Ball Roller SetMaterial WoodenSize 194x160x100mmQuantity of Puzzles About 32PcsBattery 1 x AA Not Included Package Included 1 x Wooden Mechanical Ball Roller Set