Corbels: Made of virtually indestructible high-density urethane our corbels are cast from steel molds guaranteeing the highest quality on the market. High-precision steel molds provide a higher quality pattern consistency, design clarity & overall strength & durability. Lightweight they are easily installed with no special skills. Unlike plaster or wood urethane is resistant to cracking, warping or peeling. Factory-primed corbels are ready for finishing. Measures 4 1/4 in. high x 4 in. top width x 2 1/4 in. bottom width.