100% All Natural Himalayan Rock Salt. A 550 million year old source of minerals and trace elements for your horse or pony. Mined from the vast and ancient Himalayan mountains, the distinctive rose pink color comes from the salts high mineral content, such as iron, potassium and magnesium, which are all vital for maintaining health. Himalayan rock salt licks are literally "rock hard, this means that horses and ponies are unable to bite chunks off the block, a problem that can occur with the softer pressed salt licks. These licks are also much more weather resistant, which means they can be safely left outside in the field for horse to "self dose. Our experience has show that horses do prefer these to other salt licks. Each Rock Salt Lick is approx. 2 1/4" H x 4" D. Specially designed to easily fit in any standard salt lick holder.