With the Himalayan Rock Salt Spool, your small animal will receive 200 million years of accumulated energy plus many of the natural minerals needed by all animals. When consistently offered these licks, the animals will have a balanced intake of iron, potassium, magnesium and other minerals which are all vital for maintaining health. The distinctive pink color comes from the high mineral content. The licks have a hole drilled through the center. Not only does the block provide nutrition...it can help to relieve boredom.