<B>Materials and Ingredients:</B> Fire-proof skull,fireproof cement, and totally non-toxic. <br> <B>Add realism: </B> It is NOT burning. mouth and eyes position, to allow flame to pass through. Soot accumulation is part of the chemical reaction when gas/wood burns. The skulls are life size, detailed and very realistic.<br> <B>Compatibility: </B> These are perfect for a fire pit or fireplace, and make a great decoration!