Andux 10pcs/Set Squash Racket Tennis Racket Vibration Dampeners Shock Absorber Silicone Tennis String Shock Damping BZQ-01 1. Vibration Dampeners Material: High-quality silicone. Installation method: placed in the middle of two lines. 2. Vibration Dampeners Function: Reduce vibration of tennis string 3: Make shot more comfortable. 10pcs/set. 4: Reduce the incidence of tennis elbow