Backflow Incense Burner - Snake and Skull BACK63Backflow Incense Burner Snake and Skull Material: Resin and Metal For Use With: Backflow Incense Cones Only Cone Included: No Approximate Burn Time: 30 Minutes Product Information: Backflow incense flows down through a backflow burner and creates a mist around the product. This item must be placed on a heatproof surface. When backflow incense burns the mist it creates can leave a light residue on the burner and the surface the burner is placed on.