籃球的尺碼？

Basketballs were first manufactured around 1894 by Albert G Spalding. The basketball as we know it came about in 1934, with the official size 7, or 30”, being decided as the standard basketball size for men. The smaller women’s size was officially recognized much later.
Spalding has been NBA’s officially recognized ball since 1983. The NBA (and WNBA) basketballs manufactured by Spalding measures 29.5” in circumference (28.5” for the women’s match). That is, official size 7 for men and 6 for women. The men’s basketball is pebbled with a density approaching 122 per square inch, and this helps retain a good bounce for a longer time. This ball has a leather cover, suited only to indoor play. The wide channel design ensures smooth bounce.

The Spalding Rubber Men’s basketball is manufactured according to the requisite NBA specifications, and it is good for both outdoor and indoor play. It has a circumference of 29.5”. This brown colored ball has the NBA logo imprinted on it.

The latest, and very popular, Spalding basketball lines are the TF 100 and TF 1000. These balls are used by basketball pros during official matches.