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Under IRB Rules match balls at the start of the game must be;
"65.71-68.75 kilopascals, or 0.67-0.70 kilograms per square centimetre, or 9.5-10.0 lbs per square inch", where the balls length in line 280 - 300 millimetres circumference (end to end) 740 - 770 millimetres circumference (in width) 580 - 620 millimetres
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