I'm particulaly well-suited to answer this question because I've been playing tennis for 37 years, I'm a nationally certified tennis instructor, and I'm also a mechanical engineer. So, I know alot about vibration.\n\nI can tell you with complete surety that tennis racquet vibration dampeners are absolutely useless. In fact, the only way to prevent harmful vibration that could hurt your elbow is to avoid hitting the ball outside of the sweet spot.\n\nWhen the ball hits the sweet spot, no vibration reaches your elbow because it is completely absorbed evenly by the strings. Since good tennis players always hit the sweet spot, they have no need for a vibration dampener. Perhaps that's why most of the better players don't use vibration dampeners.\n\nHowever, if a sporting goods company paid me $1M dollars to use a vibration dampener, then you can bet I'd use one whether it worked or not.