It depends. What sports ball?
They are made from lots of different materials which vary from one sport to another.
Balls were manufactured by Charles Goodyear around 1836.
England, UK
balls
The first bouncy balls were made of natural rubber. This material allowed the balls to bounce high and retain their shape after impact, making them popular toys for children and adults alike.
In the sport of football, the slang-term 'pigskin' is used. This is due to the fact that the first balls were made out of natural materials, such as inflated pig bladder.
"Bouncing into Science: Investigating the Physics of Sports Balls"
Squash balls can be purchased online through a variety of websites such as Amazon and Sports Chalet. Squash balls are also available at many local sports and athletics stores such as Sports Authority or Academy Sports.
Different sports require different properties in the ball to optimize performance. For example, soccer balls are typically made of leather or synthetic materials for durability and touch, while tennis balls are made of a felt-covered rubber for bounce and spin. The choice of material is crucial in ensuring the ball is suitable for the specific demands of each sport.
Balls
At first the tennis balls were made of leather stuffed with chalk, sand and wool.