Gamma String Things Vibration Dampener Jar of 60 Vibration Dampeners Crab/Flip Flops/Mask/Dolphin : Give your racquet some personality with Gamma String Things Vibration Dampeners. Reduce arm injury from harmful vibrations and have a little fun all at the same time. Have fun with these trendy new designs! Jar features 6 different playful images. Reduces injury from shock and racquet vibration on ball impact.