'ULTIMATE' PITTSBURGH CUT - Fine layered sandstone suitable for small and multi-scale applications. Excellent for all shale outcroppings. Approximately 4-3/4"H x 15"W x 1" thick. MASTER CASTINGS are high density polyurethane reproductions of actual rock formations from around the U.S.A. Great care was taken to hold the most intricate details. These lightweight castings may be easily carved, painted and mounted directly on your layout with minimal effort. They may also be used as 'Make-A-Mold' masters for making highly detailed latex molds.