Continue building strength in your throwing arm this season as you toss around the SKLZ(R) Weighted Baseballs. This set comes with a 10 and 12 oz. ball, perfect for loosening up your arm before making a big start, or for long and short training drills during practice sessions. Train With Purpose Includes one 12 oz. baseball and one 10 oz. baseball Made with the same construction and materials as a regulation baseball Weighted design are ideal for strengthening your throwing arm Can be incorporated into training or pre-game warm-ups Additional Details Manufacturer's Warranty: 1-year