Material: 5pcs of 2.5cm diameter metal balls, 0.7cm diameter metal frames and wooden base with a mirror in the middle. Weight: 0.92 KG Dimension: 18(L)*15(W)*18cm(H) Notice: This balls swing between 60 to 110 times with high quality. 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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