Brain Game,Cube,Good tool for Intelligence Development This product contains small parts, children below 8 years old needtheir parents to play with them, so as to avoid suffocation Eco-friendly, recyclable material product, harmless to human and environment Great corner cutting ,tension adjustable Unlike ordinary 3x3x3 cube, with four water chestnut as the center fixing the whole cube 3D gear is designed Art beats nature. Rubik's Cube Rubik's cube designer, 26 blocks of the cube is a gear, meshing