The boxing ring is square and should have on the side between 4,9 and 7 meters. It has four elastic strings, with a diameter between 3 and 5 centimeters, and they must be hung on the posts at 41, 71, 102 and 132 inches from the ground of the ring.
The posts should be coated with a smooth surface, so the boxers do not get hurt when they hit one of them.