Das is a modelling clay that air-dries. In other words, unlike traditional clay sculpting, you don't have to fire it in an oven. In fact, it isn't actually a clay at all; it's a very fine paper powder. All this might make you think that proper sculptors wouldn't use it but that would be a mistake, because you can produce wonderful, fine sculptures fit for a gallery with it AND it's very easy to work with too. P.S. I've tried other air-drying clays but DAS is definitely the best one to use.