Backflow sleeping bones dragon skull incense burner 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 can leave a light residue on the burner and the surface the burner is placed on. this is from natural oils and resins within the incense and can be wiped clean with a damp cloth. never leave burning incense unattended. dimensions: 15,5x14,5x14 (cm)