In stock. Manufacturer Part Number (MPN) ROMLB. Rawlings has been the official and exclusive ball supplier to Major League Baseball (MLB) since 1977. All Rawling officially licensed Major League Baseball (MLB) pro genuine real authentic on-field game competition playing balls are produced with the finest materials available. The baseballs are carefully assembled, weighed, measured, tested, and inspected for the highest quality and consistency. It is this craftsmanship and attention to detail that enables Rawlings to meet the rigid specifications established by Major League Baseball (MLB).