The Wilson Extra Duty (4 Ball Tube) tennis balls are USTA and ITF approved for competitive play.
They are made with premium tex/tech industries felt for extra durability and are the official ball of the US Open.
Features Include:
- USTA and ITF approved
- Made with premium tex/tech industries felt
- Extra Duty: Optimal performance and durability on hard courts
- Ideal for longer play on hard court surfaces
- US Open official ball
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