Wilson US Open 4-Ball 18 Can Case (Swiss Ball)
This ball has a Swiss logo on it and is approved by the Swiss Federation for official tournaments, Rado Interclubs or Club Champion Trophy.
Constructed of premium high-grade wool that is woven into a thicker, denser felt, the Wilson U.S. Open tennis ball is known for its superior playability, consistency and durability. 18 cans per case. 4 balls per can.