Sometimes something simple and old world can add a little indescribable charm to your treatment room... while providing a functional benefit. These Iron and Copper Essential Oil Diffusers do just that... with a unique style. I don't know if it is the simplicity, the design itself or the Iron and Copper, but I just LOVE these! And for under $30 bucks, you can't go wrong. Light a tea light candle in the base – as the fluid warms, aroma will diffuse in the air.