The Head Tour XT are premium tennis balls designed for club and tournament players seeking ultimate control and accuracy. They are made using innovative Impact (EN)Core technology to deliver excellent touch and easy controllability and can be used on fast clay and hard courts. The balls perform well even in high temperatures and they ensure enhanced durability. Rigorously tested for more than 2 years both in the lab and on the court by professional tennis players, the balls provide a great blend of performance and longevity. They are supplied in a tube of 4 balls.