This Wilson Pro Feel Dampener twin Pack blue/yellow reduces string vibration for superior dampening. This dampener was built by people or players with a deep devotion in the game. It was made from a polymer blend sand which construction to reduce string vibration for superior dampening. In this 2 pack of dampeners you recieve one blue and one is yellow to match your choice of style. These dampener have been designed to match the Wilson Signature "W" for style and quality.