Metal/Steel? Oil Diffuser This diffuser is not made of lightweight metal- A long-lasting & unbreakable oil warmer worthy of your finest essential oil blends. Holds Standard Tea light Candle With Attached Bowl On Top To Hold Scented Oil Create a Relaxing Atmosphere in Your Home Meditation Aromatherapy The diffuser has 3 posts to support a bowl above a tealight candle holder, which focuses the candle heat accurately and efficiently. Approx 5" This diffuser shows signs of use in the bowl, but it just keeps getting better looking with age