Champro Official League Flat Seam 300 Series Baseballs – DZN\r\nPlay Longer with the MBT ( Moisture Barrier Technology ) from Champro Sports. The MBT increases the useful life of a baseball by protecting it from the harmful effectus of moisture.\r\nMBT is a thin, flexible, polyurethane liner that is applied to the ball just below the cover to prevent moisture from penetrating the yarn winding. Champro Sports MBT baseballs perform better, and last longer!\r\nProduct Features:\r\n\r\nOfficial League Approved\r\nFlat Seam\r\nMBT\r\nFull grain leather cover\r\nDouble cushion cork core\r\n\r\nItem # CBB-301