These ArtStone bowls provide beautiful indoor/outdoor placement. The Water-Minder™ feature outperforms its competitors for successful growing. Made from a lightweight and durable blend of resin and natural stone. Features a rubber (removable) stopper for drainage, no need to punch holes and a footed bottom that allows for airflow. Lightweight and durable. Includes a built-in unique Water-Minder™ reservoir that re-feeds plants as needed, no need for saucer or tray. UV and frost resistant, can be left outdoors year-round.