Rubber helps Tennis Balls bounce better. If you get the kind of tennis balls with a very solid and not hollow rubber, it won't bounce. If it's hollow it will bounce way better. How could tennis balls not bounce without rubber? Tennis balls are made of rubber because it helps it bounce. This may sound silly, but how could a tennis ball bounce without being made of rubber? Tennis balls need rubber so that when they come into contact with the ground they do not burst or crack. It will dent slightly and go back to its original form. This is an advantage to a tennis ball being made out of rubber. so it can bounce.
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Rubber can bounce for a longer time and it can be played be a tennis racquet (you can not hit a cricket ball with tennis racquet) and one more reason is there is none other material other than rubber balls are made of rubber
Rubber is known for its ability to bounce, and how strong it is. A tennis ball is used for the sport of tennis. It needs to be able to bounce, and be strong and sturdy so it can be hit. That is why rubber is a major use in a tennis ball.
They aren't made of wool they are rubber on the inside with a layer of yellow felt on the outside.