Hilton Herbs Himalayan Salt Licks have been analysed and have been shown to be predominantly sodium chloride, with other trace elements such as potassium, magnesium (vital for maintaining health) and iron which is responsible for the distinctive rose pink colour. Himalayan Rock Salt Licks are literally 'rock hard', which means that horses and ponies are unable to bite chunks off, a problem that can occur with the softer 'pressed' salt licks. The licks are also much more weather-resistant and can be hung up in the field for horses and ponies to “help themselves”, exactly as nature intended.