The Official Ball of the US Open since 1978.
These Wilson US Open tennis balls are known for their superior playability, consistency, and durability on the court. They are constructed of high-grade wool that is woven into a thicker, denser, extra-duty Milliken felt for high visibility and longer wear on all court surfaces. Wilson US Open tennis balls are USTA and ITF approved for competitive play.
Specification: Extra-duty Milliken felt. USTA and ITF approved.
Pack size: 6 x 4 ball cans.