Un-fragranced  Backflow Incense Cones when they are burned, the smoke flows down the incense tower like a waterfall, creating an unusual and beautiful effect.These cones are only for use with Backflow Incense Burners.Each tub contains 45 Incense cones with instruction how to use safely.   Warning: Keep away from children. Backflow Incense can damage varnished surfaces, always use on a mat. To be used indoor and with no drafts for best effects.