The color is transparent, and the color of the anchor point inside can be chosen at will, generally blue is more. The ball is double-layered, with ropes attached to the anchor points, two handles on the inside of the ball, and a safety belt. The player stands inside the ball, straps the seat belt around his waist, and holds the handle with both hands. Players must wear helmets and knee pads to ensure their own safety. Players collide with each other, knocking each other down to win.
