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This rugged casting is hollow, approx. one-inch thick, and open at the bottom.  It is manufactured from construction-grade GFRC cast stone to withstand 9,000 psi (pounds per square inch) of pressure and freeze-thaw conditions.  It weighs between 50-60 lbs., but is an exact replica of a size of boulder that can weigh 800-1,000 lbs. 

With a lifetime guarantee, this model is available in a color choice of Sandstone, Slate Gray (popular in the Midwest and East Coast) or Red Rock.