O-SCALE GRAY FLAGSTONE STYROSTRUCT is a modeler's dream material! Cuts Clean! Bends Easily! Made of thin 1/8" high density styrene-foam that is "heat-set" embossed to give a sharp clean masonry texture. Painted to give a natural appearance of real brick & mortar. Sheets measure 15-1/2"x 7-3/4"". Contains 2 sheets per package.