These pressurised tennis balls come from the top sports brand Wilson, and have a high durability because the balls are made of quality materials. The tennis balls are made of rubber and a fluoro felt, ensuring the tennis balls stand out on the court. The tennis balls have are steady and have a consistent bounce. These Team W Practice tennis balls have a good playability and are suitable for training. These tennis balls are mainly for use on gravel courts. This version is supplied in a tin container, containing 4 tennis balls.