There are many brands of table tennis balls, including Double Happiness in China, Butterfly in Pisces, Donik, Stika, and Youla. Generally speaking, stars are used to classify quality, and the game balls are three-star. In terms of properties, the standard ball is 40mm, and the rebound height from a height of 20cm is 16cm. Since the process of making the ball is not difficult, the ball used in the game usually depends on the sponsor. Judging from various international competitions, the ball of Double Happiness is the most widely used. Butterfly's ball is also top notch.