A basketball is a typically a synthetic sphere with slightly raised bumps for traction. The ball is sized according to league and gender. Youth basketball (ages 8-12) usually use a basketball, 28.5-29 inches in circumference, with a weight of 18-20 oz. High School girls use the same size, while high school boys us a ball 29-30 inches in circumference with a weight of 20-22 oz.
Buying a Basketball