Set of 4 new hard baseballs, also including tennis balls, a soft hardball practice ball, and a sand ball. - Ball Type: Hard baseball - Quantity: 4 balls - Other Balls: Tennis balls, hardball practice ball, and sand ball Thank you for viewing. These are perfect practice balls for those transitioning from softballs to hardballs. The hardball practice ball has hardball seams but is softer and lighter than a hardball, so it's less likely to cause shoulder pain during pitching practice.