These Goloka Dragons Blood incense cones can be used with a backflow burner to create impressive smoke flow displays.
There are 24 cones per resealable tin with a burning time of approx 20 minutes per cone.
Please note that it is normal for backflow cones to take up to 10 minutes to create a smoking/mist effect when used with a backflow burner. After burning backflow cones it is normal for a light oily residue to appear on the oil burner, for this reason I recommend protecting any furniture it is placed upon suitably. The residue can be easily wiped off the burner with a damp cloth. Please exercise caution when burning incense.