Rose Backflow Incense Cones Rose Backflow Incense Cones Rose Backflow Incense Cones Box of 10 backflow incense cones £2.99 Quantity: at £2.99 each Add To Basket When Backflow Incense Cones 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 box contains 10 cones. 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.