FURTHER INFORMATION ON OUR WICKS: The wicks of the concrete fire are basically “indestructible”. As mentioned above, however, the wick needs wax to burn so that it does not “have to” burn itself. In the instructions for use, we therefore wrote that “ideally” the wick should only protrude 2 cm from the wax. The wick itself is made of a non-flammable, very fine-pored material. This pulls the paraffin up through the pores and burns it. However, if there is not enough paraffin at the tip of the wick, it will inevitably burn a little over time. In addition, more and more wax is burned when the surface of the wick is larger. This means that the further the wick protrudes from the wax, the more wax is burned, since the surface of the wick rises as the paraffin level decreases. However, if the wick always has enough wax (i.e. it does not protrude more than 3 cm) it does not burn off.