The standard basketball  (external link) is between 29.5 and 30 or 30.5 inches ( 74.9 to 78 cm ) in circumference, 9 1/2 inches in diameter and weighs 20 to 22 ounces ( the variances allowed are determined by the particular rule set ). It is used by: FIBA, men and women; NBA; and NCAA, men.

The "small ball", is between 28.5 and 29 inches ( 72.4 and 73.5 cm) and it is used by the NCAA, women and the WNBA. Circumference is the major difference between ball used in different leagues.
It used to be that the width of the channels used to vary, but this difference appears to have evaporated ( 6.35 mm is now the standard maximum ).

Spanish ~ Español - balón ~ pelota


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Basketball  (external link)

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