Designed to develop maximum strength and drive through the hitting zone. 2.9" in diameter and weighs 425 grams. Can be used for both fastpitch softball or baseball. Used for both front and side toss. The optimum use is when the front toss method is used. With its weighted design, start out slowly with 3 to 6 solid hits and increase to maximum of 18 to 24 in one hitting session. Stronger design. No silica fillers.