The salt crystals used to make these candle holders are sourced from the Himalayan mountains, and they are believed to have various health benefits due to their high mineral content. When the candle is lit inside the holder, the heat from the flame warms the salt crystals, releasing negative ions into the air. This process is said to purify the air and create a relaxing and calming atmosphere in the room. Due to the unique nature of the salt crystals used to make these candle holders, each piece is one-of-a-kind and may have slight variations in color and texture. They make a great gift for loved ones or as a special treat for yourself, adding a touch of natural beauty and relaxation to any space.