FIVB Rules specifying the correct weight and size of a volleyball
The ball shall be spherical, made of a flexible leather or synthetic leather case with a bladder inside made of rubber or a similar material
Its circumference should be between 65 and 67 cm
The weight should be between 260 and 280 g
Its inside pressure shall be 0.30 to 0.325 kg/cm2 (294.3 to 318.82 mbar or hPa).
Its colour may be a uniform light colour, or a combination of colours
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