DIY Technology Invention No Carbon Gravitational Potential Energy Into Kinetic Energy Manual ModelDescription:Style:PuzzleType:PracticeMaterial:WoodColor:As the picture show Size :Lenght :20cm Height :39cmWeight :320g Package included:1Xmaterial package1XglueDescription:Style:puzzleType:practiceMaterial:woodColor:yellowSize about:21cm long、32cm highWeight about:150g Package included:1Xmaterial package1Xglue