Three different rim weights to choose from, giving varying degrees of gyrational moment. The Low Moment is for throwers who have difficulty spinning a heavy rim. Great for high school programs and certain weather conditions. The High Moment is for advanced throwers. The high rim weight produces a very stable flight. Designed to remain in the hand longer for better power application. The Very High Moment and Ultra High Moment are also for advanced throwers and have the greatest gyroscopic stabilizing effect. Recommended for competition only. Meets High School, NCAA and IAAF specifications. OTE HIGH MOMENT DISCUS WON GOLD, SILVER BRONZE MEDALS AT 2001 WORLD CHAMPIONSHIPS. Legal for Men 18 49. Please Note This item CANNOT ship to P.O. Boxes, APO, or FPO Addresses. It CAN ONLY ship to a Street Address.