The example of stress balls shown above is exactly what you think it is.
Stress balls come in many different styles and versions nowadays. The following is a few different styles available, but they have many more than this. Go there and browse.
This is a stress ball that looks like a pile of poo. This is from a line of stress balls called splat balls. The splat balls line has ton of very creative and unique stress balls to select from. Browse All Splat Balls Here
This version here is another stress ball from the splat line. This is called the splat ball egg. It looks like an egg in a frying pan at the moment of impact when you bounce it or throw it at the desk or against the wall. Click the image of the splat ball eggs you see pictured here for more information about these, and to learn how to get one online from this source.
These balls shown here are somewhat basic in nature, but I selected these out of the available bunch due to the fact that there are tons of positive customer reviews and ratings, and it happens to be a top seller in it's category. With this kit, you would get all three balls shown here.
The main feature with these, is the fact that they all offer a different level of resistance. These are recommended for hand and wrist therapy and exercise.
It also comes with a full colored exercise booklet that will help you use these balls in the right way to heal and repair certain injuries and ailments.
Read more about these, or browse through a wide selection of other therapeutic stress balls and medicine balls by clicking the image of the three balls you see here. You will also be able to check out all the customer review comments both good and bad.