This little plastic accessory on some racquets is a tennis dampener, also known as a shock absorber. However, dampeners should not be confused with string savers. Dampeners are built with one purpose in mind—to absorb the vibrations generated when the strings get in contact with the ball. A tennis dampener will also change the sound on ball contact.
Tennis Racquet Dampener’s Purpose. The sole purpose of the dampener is to reduce the vibrations off the racquet stringbed. Players that like vibration dampeners mainly use it because it decreases the “ping” sound the ball makes at impact. For many players this is more of a mental purpose than a physical purpose.
Dampeners do not help tennis elbow, change string tension, increase string durability, boost power, add spin or any of the other benefits you may have seen touted elsewhere. The reason this misconception has spread is due to manufacturers using terms in their marketing to make you think playing without a vibration dampener is leaving you open to all sorts of elbow problems.
It is debatable, as some players prefer the feel of no dampening material. Tennis Racquet Vibration Dampeners are not for everyone but you should give it a try if you have access to one. You simply need to put the felt pads on top of your Tennis Racquet Strings and you’re good to go. Do Tennis players need Tennis Racquet Dampeners?
In truth, the name "vibration dampener" is a misnomer as they don't even dampen the vibrations that many people feel lead to tennis elbow. (Someone actually did a scientific study on this which may be read in the book "Technical Tennis.") The only thing dampeners do is cause about one volley per match to go awry as the ball hits the darn thing.
So, you have a newly bought racket and you have been playing for a couple of months and you see on TV that pros have this small rubber on the bottom of their rackets and you wonder what that is. You google it, you ask around and you find out that its a vibration dampener. I call it the shock absorber but its most commonly referred to as a vibration dampener.
There are many reasons you might choose to buy tennis racket dampeners but it is not easy to find the best suitable tennis racket dampeners for you. But don't
You will see the round version on most tennis rackets. These dampeners are very popular because they are relatively easy to use. They are also very light, so the balance point of your racquet is not affected. The disadvantage of these dampeners, however, is that they sometimes detach from the strings and then fall out.