newton'；s摇篮

newton's cradle *Dimension: 9*7.5*9cm. * Material: chromed iron +5stainless steelballs+wooden board.Stainless steelballs' diameter: 11.3mm. * We are specialized in producing Newton's cradle. Newton cradle is a good education toy for kids to learnPhysics. This product will be a good choice to decorate room. *Our balance balls depend onLaw of conservation of momentum and the theorem of momentum to swing the ball each other,when you pull the forefront impact second ball,the lasted ball will waggle.* You can choose any color. We can print clients' logo. * Packing way:1set/bubble /colorful box, 72colorboxes/ctn. Ctn Meas: 28cm*17.5cm*39cm.* Net weight of each: 590g. G/N: 18/16kg.If you have any question or need more information, plsfeel free tocontact us at any time.