Its a spherical ball of 12 ft or 9 ft in diameter . The inner diameter of a zorb ball is 6 ft in both cases. It has 2 exit or entry points diagonally opposite to each other. There are 2 harnesses inside wherein people sit & tied.
The Zorb ball is physically rolled by pushing or rolled down a slope. It is an extreme form of adventure sport , hence people are advised to follow precautions.