Champro CBB7S Weighted Training BaseballsTeam SetSet of 6 Training Baseballs Full grain leather covers Raised Seams Training Program included The Concept: Conditioning with weighted balls has been referred to as Overload Training. Many players agree that training with weighted balls can improve their velocity when playing with a regulation game ball. As with other types of weight trainings they strength his or her arm by training with progressively heavier balls. Each set contains 1 each: 7 oz, 8