As you train, gradually increase the weight of the ball as you build the strength in your pitching arm. Colored-coded cover indicates the ball weight. Size of regulation baseballs are 9’’ & 5 oz. Weighted baseballs are 9’’ circumference with varying weights. WTSET (Baseball) Delivered Price $56.00 set (Complete set of 6 weighted leather baseballs. One ea. wt -7 oz, 8 oz, 9 oz, 10 oz., 11 oz. & 12 oz.) SBW-SET (Softball) Delivered Price $42.00 set Set of 4 weighted leather softballs. Set contains one 9 oz, 10 oz., 11 oz. & 12 oz. softballs with drawstring bag.