Crimson Keeper Backflow BurnerBe mesmerised as the smoke of the incense cone gentle meanders downwards. In addition to its ability to improve concentration, the backflow burner offers spiritual value by having many benefits relating to aesthetics and meditation. Long lasting fragrance: Backflow burners retain fragrance longer than using a traditional incense burner or incense stick. Please ensure you purchase 'backburner cones', normal cones will not provide the same effect.