How heavy is middle school shot put for boys?

Boys (up to Age 12) 6 lb. Shot Boys (Age 13-14) 4K (8 lb.) Shot Men (High School) 12 lb. Shot Men (College) 16 lb. Shot Men (up to 49) 16 lb. Shot Men (50-59) 6K (13 lb.) Shot Women (Youth to Junior High) 2.72K (6 lb.) Shot Women (High School +) 4K (8 lb.) Shot Women (50+) 3K (6 lb.) Shot Special Olympics 3 lb. Shot