4 lb. white salt brick. Consists of 99.0-percent purity. Extremely tough, weather resistant and is designed specifically for free choice feeding. Brick can be used for all classes of beef and dairy cattle, sheep, pigs and horses. Ingredients of brick are salt, calcium, stearate and mineral oil. Without essential vitamins and minerals, major health problems arise that could've been avoided by supplementing animals with loose mineral or a salt block.