I sell the 1oz oil to use with them, thinking about changing to 1/2 oz bottles, but I have not decided yet. They sell slow, but they do sell. I like the ceramic rings best, but you and the customer must be careful with them, bc they will crack. I tell the customer to add the fo to the ring with a dropper, if they drop too much on they will smoke especially if the bulb is too hot. I suggest 60W max. I have not tried using cut fo with them, but that is a thought too.