Re-usable urethane rubber molds for casting 2.0″ thick concrete patio stone. Nominal stone sizes listed. Single cavity Polyurethane rubber molds are produced as a tray mold design, which requires a mold box. Most customers prefer to make their own boxes, however, we also offer the mold box as a separate item. See our “Mold Design Notes” page for additional details on mold design. Multi-cavity production molds are also available in our textures or yours. Please e-mail us for more information and pricing on custom molds and textures. We specialize in large multi-cavity molds for production applications. Check out the Gallery for some pictures of our past projects.