Basketballs typically range in size from very small promotional items only a few inches in diameter to extra large balls nearly a foot in diameter used in training exercises. High school and junior leagues normally use NCAA, NBA or WNBA sized balls. Aside step 1 high yields 2016 pdf the court and the baskets, the basketball is the only piece of equipment necessary to play the game of basketball. Therefore, the ball must be very durable and easy to hold on to.
As in most inflatable balls, there is a small opening that allows the pressure to be increased or decreased. Indoor balls tend to be considerably more expensive than all-surface balls due to cost of materials. In addition, brand new all-leather indoor balls must be “broken in” first to achieve optimal grip before use in competition. Outdoor balls are commonly made from rubber to cope with rougher conditions, and they need to be filled with more air to retain a suitable level of air pressure in colder weather.
Different sizes are used for different age groups. Men and boys ages 15 and up. This is the official size for men’s high school, college, and professional. Women and girls ages 12 and up. This is the official size for women’s high school, college, and professional.