Modern tennis balls are made from vulcanized rubber (rubber cured with sulfur), a compound that is highly durable and strong, with the right consistency. The most expensive ingredient in a tennis ball is felt, which can be adjusted in different ways to alter of the ball's properties. Steaming the felt heightens the nap and makes the substance fluffier. This increases the ball's wind resistance and control, while reducing the bounce and speed. A compact nap causes a tennis ball to skip on striking the racket or hitting the ground.
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