These are the special Roland Garros edition of the Wilson clay court tennis balls. The gas-filled tennis balls from Wilson are highly durable because the balls are made using high-quality materials. The tennis balls are made from rubber and a fluoro felt, which makes the tennis balls stand out on the tennis court. The tennis balls have constant playing characteristics and a consistent bounce. These tennis balls have an Element Guard system that keeps moisture out and minimises clay pick-up. The ball offers good playability on clay courts and is suitable for training and competitions. This variant is a tin containing four tennis balls.