Need a clean but dramatic way to display your merchandise? The concrete riser serves double-duty as a container or a product riser. Use solo or in multiples for added interest to displays. These concrete cubes are incredibly light weight and suitable for inside or outside purposes. Made of Fiberstone, a cement-like mixture of poly-resin, fiberglass, and stone powder. The cube doesn't have a drain hole for outdoor plants. For indoor plants we recommend using a plastic liner.