Yes, you want to get the large sheets of pink, blue or green insulating foam...the color doesn't really matter, it is mostly different by name brand is all. These kinds do not get little balls all over, they have very fine grain to them. It's so much easier to works with, can be cut, shaved, sanded and Dremeled perfectly...and is much easier to make details on. We have pink at our stores, in several different thicknesses. If you can find thicker than 1/4 inch, it would work much better for carving stones and for sturdiness. We usually try to get at least 1 1/2 inch to 2 inch thickness...thicker than that is even better, if you can find it. Just remember, this works the same as other foam, though, that you can't spray paint it unless you paint a primer coat on it first...spray paint still eats it.