Use Champion Sports' Leather Basketballs in all of your big games because the balls meet high school and college specifications. Each ball has a soft-to-touch Cordley composite leather cover and a 2-ply butyl bladder that won't leak air. Use the balls inside or outdoors. Available in three sizes. The 29 1/2" ball is the official size for men's high school and college basketball; the intermediate ball (28 1/2") is the official size for women's high school and college basketball and the junior ball (27 3/4") is the official size for junior high basketball.