Vibra Worm - 6 Pack - Gel Filled Long Tennis Racquet Vibration Dampener - Premium Quality - 2023 Model - Over 100,000 Worms SoldGel Filled vibration dampener is light weight with high vibration dampening. We have been selling these for year and are constantly getting new stock. Well over 30,000 units sold. But please be warned, to keep light weight..