The finger spinner (fidget spinner), also known as a finger top, is a flat-shaped toy with a bearing in the middle [1]. Its shape may be a regular triangle with three corners wrapped in a circle, or it may be a straight line. The shape, the edge may also have heavier objects, increasing the moment of inertia. There are many different materials for the gyro, such as brass, stainless steel, titanium, copper [2] or plastic [1]. Use your finger to pinch the center bearing part of the gyro, and turn it with a little force [3].
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