http://www.komodoproducts.com/produc...rain-10l?id=37

Here is the English translation of what is most likely the same thing on the bag.

Your not not feeding this stuff to your skink so who cares if it's digestible. If you are that worried about impaction feed in a bowl. If your animal is properly heated and hydrated you shouldn't have an issue with a substrate like this.

Its basically organic sandy soil as far as I can tell. I'd pile it up nice and high in the enclosure wet it down so it sets and the skink can burrow if given the choice.