US Open Extra Duty SWISS 18x 4 tennis balls

The official tennis ball of the US Open since 1978. Approved for competition by the USTA and ITF Made from premium felt from Tex/Tech Industries Extra Duty: Optimal performance and durability on hard courts High Altitude: The high altitude core is ideal for tennis courts at altitudes over 3000ft (914.4 m). Regular: Optimal performance and durability on clay courts and indoor courts Turf: Optimal performance and playability on grass pitches The tennis ball range from the Tennis Factory Bopp in Wallisellen ranges from tournament balls to training balls and children's balls. Buy the right ball for every occasion. We equip entire tennis clubs with tennis balls and if you also need tennis balls for the next interclub season, then contact us today. Upon request, we will be happy to send you a detailed price list for large quantities of tennis balls. Our balls are available in the brands Wilson, Babolat, HEAD and Signum Pro. As Signum Pro Switzerland, we are particularly proud of our Signu