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2004 IRB Law 2 states that:
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.
length 280 - 300 mm
circumference, long way round 740 - 770 mm
circumference, short way round 580 - 620 mm
weight 410 - 460 gms
the air pressure in the ball at the start of the game must be in range 0.67 - 0.70 kg/sq cm or 9.5 - 10.0 lbs/sq inch
as required under IRB Rules
as there are technically 2 diamentions because a rugby ball is long/round and round here are the full IRB regulations
length 280 - 300 mm
circumference, long way round 740 - 770 mm
circumference, short way round 580 - 620 mm
weight 410 - 460 gms
the air pressure in the ball at the start of the game must be in range 0.67 - 0.70 kg/sq cm or 9.5 - 10.0 lbs/sq inch
A rugby ball at standard play level is expected to be under IRB rules between
410 - 460 grams - average 430