Wilson Roland Garros Clay Court Tennis Balls 4 pcs WRT115000 Properties: Wilson balls are the official balls of the Roland Garros Grand Slam tournament. The bright yellow color guarantees excellent visibility during quick ball exchanges. Pressurized balls are extremely durable. The natural rubber core ensures high bounce quality even after prolonged use. Felt reduces the accumulation of moisture and dirt. Special technology minimizes air loss from inside the ball to the outside. The pressure remains at its original level for longer and the ball bounces more predictably. ITF-approved and USTA-certified balls are suitable for play on hard courts and clay courts. The set includes 4 Wilson tennis balls packed in a practical tube.