Risers for Cast Stone Pottery by Campania International Cast stone pottery risers from Campania International are made to lift pottery and planters for better drainage throughout the year. Depending on the size of the planter, use three or four of these under the pot to give it lift and add a decorative touch to your outdoor decor. These pot risers are made by Campania International, one of the most renowned producers of beautiful and durable cast stone products in the country. Cast stone is a traditional building material that has been used for centuries all over the world thanks to its strength, attractive look and sturdiness. These pot risers will hold heavy planters that are much larger and evenly distribute the weight over the three or four risers used.