Turn any building with a flat roof into a superdetailed model in minutes with this kit from Cornerstone, that makes it easy to model a typical tar and gravel roof on all kinds of commercial, industrial and railroad buildings from the steam-era to the present. Pack includes 8-13/16 ounces (250g) of real crushed stone – enough for several projects – that’s the right size and color for authentic results every time, in a recloseable plastic bag.