Material: 5pcs of 2.2cm diameter metal balls, Wooden Stand Weight: 0.5 KG Dimension: 17(L)*16(W)*16cm(H) Every action has an equal but opposite reaction-right before your very eyes. Science Balance Ball demonstrated clearly and simply and with a touch of a amusement. If you pull up one ball and release, you will see only one ball move from that reaction. If you pull up two Toys balls, two balls will react. Notice: the balls do not swing indefinitely and eventually stop.--Professional Seller in 'Newtons Cradle--Makigo.
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