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Tennis balls are a type of sports equipment specifically designed for the game of tennis. They are typically made of rubber with a felt covering, which provides the necessary grip and bounce during play. The bright yellow color is most commonly associated with tennis balls, although other colors like white, green, or orange can also be found depending on the surface being played on and the type of tournament. Tennis balls come in different levels of quality, from recreational to professional grade, with varying degrees of durability, bounce, and spin. Collectible tennis balls may feature special designs or commemorative markings, making them valuable to collectors. Despite not being related to jewelry or ice skating collectibles, tennis balls remain an essential part of the sport of tennis and can be appreciated by players and collectors alike.