Inflatable Water Walking RollerAudac water roller ball is widely used in water amusement park,swimming pools or seashore playing center. It usually has two sizes for kids and adults. Diameter*length=2*2.5m are for kids playing, and Diameter*length=2.2*3m are for adults playing. The point need to emphasize is that Each Audac water roller ball can be customized to your specific size requirements.