No.7 is a standard ball for men, with a weight of 6-65g and a circumference of 75-76cm;

No.6 is a standard women's ball with a weight of 51-55g and a circumference of 7-71cm；;

No.5 is a juvenile ball with a weight of 47-5g and a circumference of 69-71cm；;

No.3 is a ball for children, with a weight of 3-34g and a circumference of 56-57cm.

Basketball is a round body, and the outer cover is generally made of leather, rubber or synthetic materials.