Champion Sports Weighted Training Softball Set of 4 Take your team’s pitching to the next level with this colorful Champion Sports Weighted Softball Set. The set features eight balls in sizes ranging from five to twelve ounces, so you can gradually increase the weight as your pitchers build up arm strength. Each ball is made with a combination rubber and cork center that provides a similar feel to a regular softball, so it will be easy to switch back after each training session. The weighted softball set comes with a sturdy nylon bag to keep the balls together and easy to carry down the park. Features: Same feel as a regular softball Graduated color coded weights Gradually increase the weight of the ball as your arm strengthens Combination rubber and cork center provides a similar feel to that of a regular softball Set of 4 training balls weighted from 9-12oz Nylon carrying case included for easy transportation 12\” Circumference Set contains a variety of bright, highly visible colors Item # SBWTSET4