100% all natural straight from the Himalayan Mountains. A great source of iron, potassium and magnesium, which are all vital intake for maintaining your horse’s health. It is rock hard and difficult for horses to break chunks off. Safe to be left out for horses and is much more weather resistant so it will last longer than other salt licks. 4.4 lb block. Shaped to Fit Most Holders. Measures approximately 2" x 4".