PowerAlley Leather pitching machine baseballs are specifically designed for Heater Baseball Pitching Machines. These balls are real leather baseballs with kevlar seams for greater life and accuracy. Perfectly molded at the factory Heater baseballs are the world's most accurate pitching machine baseballs. Features Real Leather with Kevalr Seams Regulation size and weight baseballs 6 balls per package Color - White. Specification: Dimension - 3 x 3 x 3 in. Item Weight - 5.4lbs.