It does what it promises. Tennis and Golf Elbow in both arms disappeared after countless attempts of exercises and tools that couldn't eliminate the problem. Highly recommended.

It is a useful rehabilitation tool for hand extremity disorders, with a beautiful design.
In all retail stores, you will find it at a price higher than €25.00 and this is outrageous. Obviously, they work with huge profit margins.
The sponge ball wears out extremely quickly.
As for the rubber for finger extensions, there is also a second one in case the first one is cut from use.