Ball: spherical, leather/synthetic, 65-67 cm circumference, 260-280 g, FIVB/Molten approved; Net: 2.43 m height (men's standard, vs 2.24 m women's), 1m × 9.5-10 m; Antennas marking the legal crossing zone
Why people argue about this
People often assume that all volleyball balls are exactly 65-67 cm in circumference, forgetting that there's a slight tolerance allowed by FIVB. This leads to arguments about whether a ball is officially legal or not, despite the rule clearly stating it must be within those dimensions.
