Being in operation since 1988, MDI Rock specializes in natural stone products. Based in Phoenix, Ariz., it provides various landscape rock products, such as riprap, flagstone, topsoil, sand, gravel and a huge selection of boulders. The firm offers a complete range of product line, including new river brown, apache pink, autumn gold, Aztec gold, black cherry, boulders, calico rose, cinders, cinnamon brown, desert brown, flagstone and much more. MDI Rock carries a large selection of accent boulders in sizes ranging from basketball size to compact car sizes and larger.