Wilson tennis balls are a professional set that will allow you to win game after game.These are the official balls of the Roland Garros Grand Slam tournament.The bright yellow color guarantees excellent visibility during quick ball exchanges, so you can be sure you won't lose sight of it.The pressurized balls are exceptionally durable, which you will appreciate during frequent training sessions.The natural rubber core ensures high quality bounce even after prolonged use.The felt reduces the accumulation of moisture and dirt, which translates into improved performance during dynamic rallies.The balls ensure your playing comfort and ease of control in sets.Special technology minimizes air loss from the inside of the ball to the outside.The pressure remains at its original level for longer, and the ball bounces more predictably.Balls ITF-approved and USTA-certified, they are suitable for playing on hard courts and clay.The set includes 4 Wilson tennis balls packed in a practical tube.