Incense fireworks. Fireworks are fireworks (also called fireworks), a thing that emits sparks of various colors for viewing when set off. Dog tails are incense fireworks. Incense-type fireworks are commonly known as "dog tail grass". They are slender strips such as welding rods. Use incense-type fireworks quickly in front of your eyes. The traces can be seen when you close your eyes or in other darker places.