Great servers have realized that power and pace are not the end-all and be-all, and that their killer shots must be backed up with a solid return game.

[The Q] decided to solve this problem with a unique design: tires that use tennis balls as the cushioning medium instead. The build begins with small cut sections of plastic water pipe. These are ...

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 ...