CoolStuffBeingMade.com: How Tennis Balls Are Made
http://www.youtube.com/watch?v=oICVzJj8EUM
Have you ever wondered how a Wilson tennis ball is made? Above is a video that explains how a Wilson tennis ball is made. Tennis balls start out as small pieces of rubber which are called slugs. Slugs are then molded into the shape of half a ball. The center of tennis balls consist of two molded rubber slugs. Glue is then applied to two slugs to form a round piece of rubber. Two pieces of felt are then used to cover the rubber ball. Logos are then printed on the balls. After that, they are packed up to be sold.
It is interesting to see the effort manufactures put to produce a tennis ball. From out side the ball looks like one circle that filled with air pressure not a combination of two slugs. The fact that the balls must be a certain size and weight and made with certain materials show how the International Tennis Federation put a legal specification. Some balls are designed for hard-court and grass, while others are designed for clay courts and an experienced player can instantly tell differences in balls.
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