Forth Seed’s Mineral Block is a block form mineral that utilizes the same quality, flavor and aroma technology found in its Forth Seed’s Mineral . Calcium 8-10%, Phosphorus Min. 7%, Sodium Chloride (Salt) 11-13%, Potassium Min. .14%, Magnesium 2.5%, Copper 2826 PPM, Zinc 8951 PPM, Selenium 36 PPM.