North American Salt 90013 Trace Mineral Brick Pet Nutritional Supplement, 4-Pound 4 Lb. Trace Mineral Brick Contains 6 Core Micro-minerals Required For Animal Health Minerals Include Zinc, Manganese, Cobalt, Copper, Iodine and Iron For All Classes Of Breed and Dairy Cattle, Pigs and Horses Major Health Problems Can Arise Without This Product