Reduces string vibrations for more comfort and a better feel. Design featuring a Roland Garros tennis ball. Pack includes 2 dampeners. Roland Garros Tennis Ball Vibration Dampeners, 2-pack. The Roland Garros vibration dampeners celebrate the peak of the clay court season with a selection of dampeners inspired by Roland Garros, which effectively absorb shocks and reduce vibrations when the ball hits the string bed. Pack includes two dampeners.