The American Stockman White Livestock Cattle Salt Brick is a high-purity cattle feed. Trace Mineralized Salt Brick contains the six core micro minerals required for basic animal health. The proper combination of zinc, manganese, cobalt, copper, iodine and iron optimizes your herd's weight gain, feeding efficiencies and overall herd performance. White Salt has 99.0% purity, is extremely tough. For all classes of beef and dairy cattle, pigs and horses. White Salt Brick is extremely tough and weather resistant. It's designed specifically for free-choice feeding and used for all classes of beef/dairy cattle, sheep, pigs and horses.