If you think that tennis balls are simply yellow fuzzy balls, one no different from another, you are most definitely wrong. Tennis balls are much more than that. Here are some facts about tennis balls that you may or may not already know:
Pressurized vs. Pressureless Tennis Balls:
· There are two main types of tennis balls: pressurized and pressureless.
· Pressurized tennis balls have a hollow core, filled with air. Some tennis ball manufacturers use nitrogen in the center, because this air tends to last longer – pressurized balls will lose their pressure after about a month
