What Is the Official Basketball Size?

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The official ball size for the National Basketball Association and most other professional adult men's associations is a circumference of 29.5 to 30 inches and weighs 18 and 20 ounces. Official balls for the Women's National Basketball Association have a circumference of 28.5 inches.

Spalding has made official balls for the NBA since 1983 using a leather exterior, except for the 2006 and 2008 seasons, when a composite material was used. Commissioner David Stern announced a return to leather after hearing numerous complaints from players. Wilson makes the official ball of all Division 1 NCAA tournaments and some international competitions. Molten, a Japanese manufacturer, provides balls for several international leagues.