BALLS

American Hub International It weighs 410-460 grams. The ball is made of leather or a suitable synthetic material. It may be treated to make it water resistant and easier to grip. Its air pressure at the start of play is 65.71-68.75 kilopascals, 0.67-0.70 kilograms per square centimetre or 9.5-10.0 pounds per square inch. Rugby balls