I'm competitive athletes, go completely to the limits and therefore had a greater collection of Mobilisation tools. Including numerous mobilization balls of different sizes, surface and strength. When it comes to solve punctual tensions (I usually use the methodology of Kelly Starrett) I achieve with this not so good results, because the "thorns" not allow it to exercise a high selective pressure within the meaning of acupressure. For this purpose I had to find out that sleek hard balls such as Lacrossbälle or the tennis ball-large Blackroll balls (if it is the black!) Are better suited.
However, when it goes larger area "roll out" instead of point resting pressure, then met this ball's purpose. So like a "closer" substitute for Blackroll that touches too much space for my taste, and therefore less results achieved as a ball. Also outstandingly suitable for the foot sole.
The ball is very tough and stable and does not crumple up, very good. So quality is right. So think before: What exactly do you want to use this ball?