Material with 5 Steel Balls, Steel Frames & Wooden Base, 0.5kg Dimension: W140*H145*D120 MM 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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