focused on the racket face with a square shape, rather than a simple circle. This leads to the length of all the network cable is very long, but the existence of structural constraints, the framework
becomes difficult to manufacture, strong enough, not a good look and feel. The last 10 years, many manufacturers have adopted more grommets, allowing the effective size of the network cable extends
to the outside of the bed frame. Another factor is the quality of the distribution of power, despite the mass distribution is difficult to achieve the optimal value, but the principle is simple,
namely light-card swing faster, increasing the ball speed; racket swing slow and heavy, but because of the quality increases, can also lead to increased ball speed, especially if applied to increase
the quality of the sweet spot, especially. Therefore, in the design of theTennis ball manufacturers,
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