Backflow incense flows down through a backflow burner and creates a mist around the Reaper Boatman. 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. This is from natural oils and resins within the incense and can be wiped clean with a damp cloth. Never leave burning incense unattended. Some of our small backflow burners come with a small foam mat that the burner can be placed on when in use, however this is not heat proof so as stated above, the burner must be placed on a heatproof surface before using. Made from resin and metal. Backflow incense cones only. (Not included but sold separately). Dimensions : 16.5cm x 15cm x 13cm.