Set of 6 leather covered weighted 9" baseballs 5 oz., 7 oz., 9 oz., 10 oz., 11 oz. & 12 oz. Excellent training aid for building arm strength and developing pitching velocity. Use in Overload/Underload training regimen to develop sport specific strength and fast-twitch muscle fibers.
You see, you spend a good piece of your life gripping a baseball, and in the end it turns out that it was the other way around all the time. - Jim Bouton