Develop strength and drive with the ultimate hitting aid. The TCB Ball is a must-have for the serious fastpitch or baseball hitter and their teams. TCB's weighted design can help develop maximum strength and drive through the hitting zone. Each ball is 4.70 inches in diameter and can be used for side toss only. With its heavyweight design, start out slowly with 3 to 6 solid hits and increase to a maximum of 12 in one hitting session.