Star Tennis

What is the number of stars on a ping-pong?

I wondered what in the world are the number of stars have do with the ball of his car, someone told me that the hardness of the ball please someone give me an answer logic

A three stars on a ball usually implies a top quality ball, compared to 9000 revolutions per minute on a ping-pong. The international rules specify that the game is played with a light 2.7 grams, 40 mm (previously 38 mm) diameter ball. The ball is necessary to have a coefficient of restitution of 0.4. The 40 mm ball was introduced at the 2003 World Table Tennis Championships. However, this has created some controversy as Chinese national team complained that it was only to give non-Chinese players a better chance of winning. A 40 mm ball tennis table is slower and less "spinny" of a 38 mm one. The ball is made of a ball bouncing high gas-filled celluloid, white or orange, with a matte finish. The choice of ball color is made according to the color table and its environs. For example, a white ball is easier to see on a green table or Blue is a table of gray.

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