Reduce the vibration of your racquet strings and subsequently reduce or eliminate the "ping" sound you hear when you strike a ball with the Prince(R) O-Damp Vibration Dampener. Reduce the Ping Silicone vibration dampener for tennis racquets Black and neon colors come in a pack of two Deadens sound and reduces vibration when in contact with a ball Dampener sits along the bottom cross string of the tennis racquet