This Head Smartsorb Vibration Dampener features rubber elastomer compound, maximum string dampening, and tapered design. This dampener helps to reduce discomfort by minimizing the level of shock felt while playing. Its rubber elastomer compound provides maximum string dampening which protects your arms. A new rubber elastomer compound with a tapered design made especially for head rackets to provide maximal string vibration dampening. Reputed to feature maximum string dampening! Makes ball contact feel more comfortable.