Elements amethyst crystal dragon backflow incense burner backflow incense burners are revolutionary products in the incense category. why? incense smoke is slightly heavier than air and descends very slowly. the backflow burner turns this effect into real art. smoke will fall dramatically in swirls and twists, through the hole and down over the item, to pool at the bottom. it is incredible to watch - like a waterfall but in slow motion. they are designed to improve well-being, help you relax and achieve inner peace. suitable for home, office, teahouse, meditation, yoga studio. safety: it is important to never leave burning incense unattended and the burner should be placed on a heatproof surface before use. in order to create the smoke cascade effect you will need to use backflow incense cones. material: resin and metal for use with: backflow incense cones only