Are these tennis balls yellow or green? It seems a simple question - the tennis balls are obviously yellow. But some people say they are obviously green. And then there are the people who say they ...

A pack of four tennis balls costs approximately $5.99, while a pack four floor savers costs approximately $2.64. Very rarely is the least expensive choice the right choice, but in this case it is also ...

What are tennis balls made of? Modern tennis balls are made of a hollow rubber core, covered in a wool or nylon shell which is known as the nap. Pressurised air inside the rubber core makes the ball ...