Eagle Foundrie

Eagle Foundries

Eagle Foundries

Tennis Balls

Tennis Balls

Tennis balls are iconic and indispensable elements of the sport, integral to the game’s rhythm and dynamics. These vibrant, fuzzy spheres have evolved over time in both design and materials, enhancing their performance on the court. Here’s an overview of tennis balls, their construction, and their role in the game:


  • Core:

    • The core of a tennis ball is a pressurized rubber sphere. Modern tennis balls typically have a hollow core filled with pressurized air to provide bounce and resilience during play.
  • Felt Cover:

    • The outer layer of a tennis ball is covered with felt, usually made from a combination of wool and nylon. The felt contributes to the ball’s texture, grip, and aerodynamics.
  • Pressure:

    • Tennis balls are pressurized to a specific level, measured in pounds per square inch (psi). This pressure affects the ball’s bounce and responsiveness on the court.

Types of Tennis Balls:

  • Regular Duty vs. Extra Duty:

    • Regular duty tennis balls are designed for play on clay and indoor courts, while extra duty balls are intended for hard courts. Extra duty balls have a thicker felt to withstand the abrasive surface of hard courts.
  • High Altitude Balls:

    • Tennis balls designed for high-altitude play have a lower internal pressure to compensate for the reduced air resistance at higher elevations.

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  • Stage Balls:

    • Stage balls are designed for beginners and children. They come in different “stages” with varying levels of compression, making it easier for novice players to learn the game.
  • Pressureless Balls:

    • Unlike pressurized balls, pressureless balls have a solid core. They are known for their durability and are often used for practice sessions.
  • Characteristics and Performance:

    1. Bounce:

      • The bounce of a tennis ball is a critical factor in the game. The felt and internal pressure contribute to the ball’s ability to bounce predictably and consistently.
    2. Durability:

      • The durability of a tennis ball depends on factors such as the quality of the felt and the level of play. Professional players often change balls frequently during a match to ensure optimal performance.
    3. Visibility:

      • Tennis balls are traditionally yellow, a color chosen for its visibility on various court surfaces and under different lighting conditions.


    1. Storage:

      • Tennis balls should be stored in a cool, dry place to maintain their pressure and performance. Avoid exposing them to extreme temperatures or direct sunlight.
    2. Replacement:

      • Regular players often replace tennis balls after a certain number of games to ensure they maintain consistent performance. Recreational players may use older balls for practice.

    Environmental Impact:

    1. Recycling:

      • Tennis balls can be recycled, and there are programs and organizations that collect used balls to repurpose them for various purposes, such as creating sports surfaces or playgrounds.
    2. Biodegradable Options:

      • Some manufacturers are exploring and producing biodegradable tennis balls to address environmental concerns associated with traditional ball disposal.