Very fine sand (so there will be tracking) but it doesn't seem to stick to our short-haired cat's feet so much.
It immediately sticks to the clumps and absorbs urine instantly, making relatively solid clumps (they never broke for me).
It covers odors quite well after a few seconds and its natural scent is pleasant (it reminds me of something sweet).
It is very easy to clean, it flows through the scoop like beach sand.

As you use it, it will produce dust. Quite a lot of dust. However, unlike other sands, this dust is heavy and falls immediately down, creating a layer at the bottom and sides of the litter box, especially useful in case of accidents.
It leaves a lot of dust on the cat as well (ours is small and clueless and struggles with it for a long time).

According to the characteristics, this dust (like the sand) is not toxic if eaten/breathed, so the only problem is the transfer inside the house.

We also tried it with pellets and it was excellent, with minimal tracking and much less dust but (because, as I said, our cat is clueless) he couldn't cover the odors as quickly and dug much more. We will try it again when he grows up if it doesn't bother him on his paws.

Finally, I think it requires a considerable height to properly absorb, with 7cm we are fine.
The supplier does not bring the larger packages and the 6L is not enough for a serious litter box. It requires 2+ packages.
The cost is high, but as the tofou becomes more known in Europe, prices will drop and we will have more options.