Backflow Burners are a fantastic focal point and make a great gift for any fantasy or gothic enthusiast. Made of resin, they are for use with backflow incense cones only. When the cone is lit, the smoke will flow down, around the backflow burner. The mist contains natural resins and oils, but any residue can be easily wiped away with a damp cloth. However, it is recommended that backflow burners are placed on a mat to avoid potential damage to furnishings. LED lighting requires 2 AA batteries (not included) where stated.