The Optimara Watermaid is an economical and time-proven, self-watering system using the same capillary mat system used at Optimara. It is made of a terracotta colored plastic. It is best for 4-inch pot sizes, but can accommodate pot sizes up to 6-inches and will keep your plants watered for 1-2 weeks. Order a Watermaid today so you can have the peace of mind that your African violet will stay hydrated the majority of the time.