2004 IRB Law 2 states:
The ball must be oval and made of four panels.
Length in line 280 - 300 millimeters
Circumference (end to end) 740 - 770 millimeters
Circumference (in width) 580 - 620 millimeters
Material: Leather or suitable synthetic material. It may be treated to make it water resistant and easier to grip.
Weight: 410 - 460 grams
Air pressure at start of play: 65.71-68.75 kilopascals, or 0.67-0.70 kilograms per square centimeter, or 9.5-10.0 lbs per square inch. The ball is stitched together so that the 4 panels are joined. On the top of the large circumference a small hole is allowed where the inner "bladder" is pushed and then the valve is glued in to the bladder. The ball is then stitched around the valve and inflated to hold the shape. The ball is coated with a poly resin to protect the leather and make it last longer under the pressure of kicking. Once the resin is dry the ball can be inflated using the valve.
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Four leather panels are cut in to what is abasically an egg shape. There panels are stitched togethercompletley with a fourth stitched leaving a 60mm area unstitched. Thios is where the bladder (the actual container for the air) is placed. The bladder is partly inflated to fill the inner ball space. The valve is secured in the area which still requires stitching. Here a lace is used to close the vent. The ball then is fully inflated.
Good ones are made of leather - You can buy plastic but these are not for IRB matches
where are rugbys made
Presently GILBERT of the UK is the largest manufacture of rugby balls
It is made of leather or suitable synthetic material. It is also treated to make it water resistant for easier grip which wet.