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The Wilson US OPEN Extra Duty Tennis Ball is the Official Ball of the US Open since 1978.
FEATURES:
- USTA and ITF approved for competitive play
- Made with premium tex/tech industries felt
- Extra Duty: Optimal performance and durability on hard courts
- High Altitute: High altitude core for best performanceon courts above 3000ft
- Regular Duty: Optimal performance and durability on clay/indoor courts
- Grass Court: Optimal performance and playability on grass court surfaces
- 24 cans with 3 balls each