This is sand. Yep. That’s all. Sand.
But if you are setting up your thurible (a charcoal incense burner), then you will need sand to put in it. Your charcoal sits on top of the sand to absorb the heat from the charcoal.
Any sand will work, but don’t buy sand from a crafts store, because craft sand has additives that are toxic when heated.
This sand is a nice, clean looking, white sand that has no additives in it and it’s all packaged up for you, ready to go. This is a convenience item, so you don’t have to hunt down sand. If you want to raid the local playground, that will work too. But it won’t be as pretty as this 😉