What is the sweet spot of the racket?

Update:13-10-2018
Summary:

It is the best hitting area of the racket face, and mos […]

It is the best hitting area of the racket face, and most of the sweet spot of the racket is near the fourth line of the horizontal line. When the hitting point is in the sweet spot, it can give you enough hitting power, ball control, and vibration. If the head is enlarged, the sweet spot will become larger and easier to control, but the head and the assembly will bring the torque. And the negative effects on weight.

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