Our tea light candle holders are made of natural salt rock crystal. Salt rock is known to be a natural air ionizer that effectively boosts the number of negative ions which are good for our health. It can help to counter the harmful positive ions that are produced by computer moniters, TV sets, microwave ovens, vacuum cleaners and tobacco smoke. In addition crystal salt helps to cure many diseases . Bio-energotherapists and homeopaths in Western Europe have recommended crystal salt lamps to support treatment of allergies, respiratory system and blood system diseases. They are often used in the treatment of rheumatism PLEASE NOTE PRICE IS FOR ONE TEA LIGHT HOLDER