By the leather, the soft gum or artificial fiber Bao Chochiao the system aerocyst round spheroid, the circumference must have between 74.9cm and 78cm, the weight must have between 567g and 650g
Basketballs are plastic made spheric air sacs wrapped by either leather, soft plastic, or artificial fibre, with circumference between 74.9cm and 78cm, and weighted between 567g and 650g.
Basketball
By the leather, soft glue or the artificial silk is chartering the round spheroid made the gasbag of the glue , there are the circumferences between 74.9cm and 78cm, there should weight between 567g and 650g