This is a bearing symmetrical structure can be turned over in the fingers of the gadgets,It popular slowly in North America on the beginning of 2016. Now it has been very popular on the we chat, There are many clicks in the Youtube.Total video traffic is more than one billion! Why is this gadget so

This is a bearing symmetrical structure can be turned over in the fingers of the gadgets,It popular slowly in North America on the beginning of 2016. Now it has been very popular on the we chat, There are many clicks in the Youtube.Total video traffic is more than one billion! Why is this gadget so hot?Do not look at it simple, as long as the hand pinch the axis of a wave can be a high degree of rotation for several minutes,Once the start completely stopped.